platform/kernel/linux-rpi.git
4 years agoi2c: tegra: Clean up and improve comments
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:13 +0000 (01:19 +0300)]
i2c: tegra: Clean up and improve comments

Make all comments to be consistent in regards to capitalization and
punctuation, correct spelling and grammar errors, improve wording.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Clean up printk messages
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:12 +0000 (01:19 +0300)]
i2c: tegra: Clean up printk messages

This patch unifies style of all messages in the driver by starting them
with a lowercase letter and using consistent capitalization and wording
for all messages.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Clean up variable names
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:11 +0000 (01:19 +0300)]
i2c: tegra: Clean up variable names

Rename "ret" variables to "err" in order to make code a bit more
expressive, emphasizing that the returned value is an error code.
Same vice versa, where appropriate.

Rename variable "reg" to "val" in order to better reflect the actual
usage of the variable in the code and to make naming consistent with
the rest of the code.

Use briefer names for a few members of the tegra_i2c_dev structure in
order to improve readability of the code.

All dev/&pdev->dev are replaced with i2c_dev->dev in order to have uniform
code style across the driver.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Improve formatting of variables
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:10 +0000 (01:19 +0300)]
i2c: tegra: Improve formatting of variables

Reorder definition of variables in the code to have them sorted by length
and grouped logically, also replace "unsigned long" with "u32". Do this in
order to make code easier to read.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Check errors for both positive and negative values
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:09 +0000 (01:19 +0300)]
i2c: tegra: Check errors for both positive and negative values

The driver's code is inconsistent in regards to the error values checking.
The correct way should be to check both positive and negative values.
This patch cleans up the error-checks in the code. Note that the
pm_runtime_get_sync() could return positive value on success, hence only
relevant parts of the code are changed by this patch.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Factor out hardware initialization into separate function
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:08 +0000 (01:19 +0300)]
i2c: tegra: Factor out hardware initialization into separate function

Factor out hardware initialization into a separate function from the probe
function. The only place where runtime PM needs to be resumed during probe
is the place of hardware initialization, hence it makes sense to factor
out it in order to have a bit cleaner error handling in tegra_i2c_probe().

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Factor out register polling into separate function
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:07 +0000 (01:19 +0300)]
i2c: tegra: Factor out register polling into separate function

Factor out register polling into a separate function in order to remove
boilerplate code and make code cleaner.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Factor out packet header setup from tegra_i2c_xfer_msg()
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:06 +0000 (01:19 +0300)]
i2c: tegra: Factor out packet header setup from tegra_i2c_xfer_msg()

The code related to packet header setting up is a bit messy and makes
tegra_i2c_xfer_msg() more difficult to read than it could be. Let's
factor the packet header setup from tegra_i2c_xfer_msg() into separate
function in order to make code easier to read and follow.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg()
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:05 +0000 (01:19 +0300)]
i2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg()

Factor out error recovery code from tegra_i2c_xfer_msg() in order to
make this function easier to read and follow.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Rename wait/poll functions
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:04 +0000 (01:19 +0300)]
i2c: tegra: Rename wait/poll functions

Drop '_timeout' postfix from the wait/poll completion function names in
order to make the names shorter, making code cleaner a tad.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg()
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:03 +0000 (01:19 +0300)]
i2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg()

The "dma" variable of tegra_i2c_xfer_msg() function doesn't bring much in
regards to readability and generation of the code.

Besides readability, it's also not very nice that the is_curr_dma_xfer
is initialized in tegra_i2c_xfer_msg() and then could be overridden by
tegra_i2c_config_fifo_trig(). In a result, the "dma" variable creates
slight confusion since it's not instantly obvious why it's set after
tegra_i2c_config_fifo_trig().

Hence should be better to have the variable removed. This makes code
more consistent.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove redundant check in tegra_i2c_issue_bus_clear()
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:02 +0000 (01:19 +0300)]
i2c: tegra: Remove redundant check in tegra_i2c_issue_bus_clear()

The tegra_i2c_wait_for_config_load() checks for 'has_config_load_reg' by
itself, hence there is no need to duplicate the check.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove likely/unlikely from the code
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:01 +0000 (01:19 +0300)]
i2c: tegra: Remove likely/unlikely from the code

The likely/unlikely annotations should be used only in a hot paths of
performance-critical code. The I2C driver doesn't have such paths, and
thus, there is no justification for usage of likely/unlikely annotations
in the code. Hence remove them.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove outdated barrier()
Dmitry Osipenko [Tue, 29 Sep 2020 22:19:00 +0000 (01:19 +0300)]
i2c: tegra: Remove outdated barrier()

The barrier() was intended to reduce possibility of racing with the
interrupt handler, but driver's code evolved significantly and today's
driver enables interrupt only when it waits for completion notification.
Hence barrier() has no good use anymore, let's remove it.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Clean up variable types
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:59 +0000 (01:18 +0300)]
i2c: tegra: Clean up variable types

Don't use signed types for unsigned values and use consistent types
for sibling variables.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Reorder location of functions in the code
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:58 +0000 (01:18 +0300)]
i2c: tegra: Reorder location of functions in the code

Reorder location of functions in the code in order to have definition
of functions closer to the place of the invocation. This change makes
easier to navigate around the code and removes the need to have a
prototype for tegra_i2c_init().

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Clean up probe function
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:57 +0000 (01:18 +0300)]
i2c: tegra: Clean up probe function

The driver's probe function code is a bit difficult to read. This patch
reorders code of the probe function, forming groups of code that are easy
to work with. The probe tear-down order now matches the driver-removal
order.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:56 +0000 (01:18 +0300)]
i2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt()

Move out code related to device-tree parsing from the probe function into
tegra_i2c_parse_dt() in order to make code more consistent.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Use clk-bulk helpers
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:55 +0000 (01:18 +0300)]
i2c: tegra: Use clk-bulk helpers

Use clk-bulk helpers and factor out clocks initialization into separate
function in order to make code cleaner.

The clocks initialization now performed after reset-control initialization
in order to avoid a noisy -PROBE_DEFER errors on T186+ from the clk-bulk
helper which doesn't silence this error code. Hence reset_control_get()
now may return -EPROBE_DEFER on newer Tegra SoCs because they use BPMP
driver that provides reset controls and BPMP doesn't come up early during
boot. Previously rst was protected by the clocks retrieval and now this
patch makes dev_err_probe() to be used for the rst error handling.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Use platform_get_irq()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:54 +0000 (01:18 +0300)]
i2c: tegra: Use platform_get_irq()

Use common helper for retrieval of the interrupt number in order to make
code cleaner. Note that platform_get_irq() prints error message by itself.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Use devm_platform_get_and_ioremap_resource()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:53 +0000 (01:18 +0300)]
i2c: tegra: Use devm_platform_get_and_ioremap_resource()

Driver now uses devm_platform_get_and_ioremap_resource() which replaces
the typical boilerplate code and makes code cleaner.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Use reset_control_reset()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:52 +0000 (01:18 +0300)]
i2c: tegra: Use reset_control_reset()

Use a single reset_control_reset() instead of assert/deasset couple in
order to make code cleaner a tad. Note that the reset_control_reset()
uses 1 microsecond delay instead of 2 that was used previously, but this
shouldn't matter because one microsecond is a default reset time for most
of Tegra peripherals and TRM doesn't mention anything special in regards
to I2C controller's reset propagation time.

In addition don't ignore potential error of the reset control by emitting
a noisy warning if it fails, which will indicate an existence of a severe
problem, while still allow machine to boot up.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove error message used for devm_request_irq() failure
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:51 +0000 (01:18 +0300)]
i2c: tegra: Remove error message used for devm_request_irq() failure

The error message prints number of vIRQ, which isn't a useful information.
In practice devm_request_irq() never fails, hence let's remove the bogus
message in order to make code cleaner.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Runtime PM always available on Tegra
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:50 +0000 (01:18 +0300)]
i2c: tegra: Runtime PM always available on Tegra

The runtime PM is guaranteed to be always available on Tegra after commit
40b2bb1b132a ("ARM: tegra: enforce PM requirement"). Hence let's remove
all the RPM-availability checking and handling from the code.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:49 +0000 (01:18 +0300)]
i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member

The "non_hs_mode" divisor value is fixed, thus there is no need to have
the variable i2c_dev.clk_divisor_non_hs_mode struct member. Let's remove
it and move the mode selection into tegra_i2c_init() where it can be
united with the timing selection.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Initialize div-clk rate unconditionally
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:48 +0000 (01:18 +0300)]
i2c: tegra: Initialize div-clk rate unconditionally

It doesn't make sense to conditionalize the div-clk rate changes because
rate is fixed and it won't ever change once it's set at the driver's probe
time. All further changes are NO-OPs because CCF caches rate and skips
rate-change if rate is unchanged.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Mask interrupt in tegra_i2c_issue_bus_clear()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:47 +0000 (01:18 +0300)]
i2c: tegra: Mask interrupt in tegra_i2c_issue_bus_clear()

The tegra_i2c_issue_bus_clear() may fail and in this case BUS_CLR_DONE
stays unmasked. Hence let's mask it for consistency. This patch doesn't
fix any known problems.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Handle potential error of tegra_i2c_flush_fifos()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:46 +0000 (01:18 +0300)]
i2c: tegra: Handle potential error of tegra_i2c_flush_fifos()

Technically the tegra_i2c_flush_fifos() may fail and transfer should be
aborted in this case, but this shouldn't ever happen in practice unless
there is a bug somewhere in the driver. Let's add the error check just
for completeness.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Add missing pm_runtime_put()
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:45 +0000 (01:18 +0300)]
i2c: tegra: Add missing pm_runtime_put()

The pm_runtime_get_sync() always bumps refcount regardless of whether it
succeeds or fails. Hence driver is responsible for restoring of the RPM
refcounting. This patch adds missing RPM puts which restore refcounting
in a case of pm_runtime_get_sync() error.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer
Dmitry Osipenko [Tue, 29 Sep 2020 22:18:44 +0000 (01:18 +0300)]
i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer

The tegra_i2c_flush_fifos() shouldn't sleep in atomic transfer and jiffies
are not updating if interrupts are disabled. Let's switch to use iopoll
API helpers for register-polling. The iopoll API provides helpers for both
atomic and non-atomic cases.

Note that this patch doesn't fix any known problem because normally FIFO
is flushed at the time of starting a new transfer.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: testunit: improve documentation
Wolfram Sang [Mon, 28 Sep 2020 11:06:47 +0000 (13:06 +0200)]
i2c: testunit: improve documentation

Mention that new CMDs will be NACKed while the old one is still
on-going, that the I2C address parameter of READ_BYTES is 7 bit only,
and reword one paragraph to be more precise.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: busses: replace spin_lock_irqsave by spin_lock in hard IRQ
Barry Song [Wed, 9 Sep 2020 04:10:01 +0000 (16:10 +1200)]
i2c: busses: replace spin_lock_irqsave by spin_lock in hard IRQ

The code has been in a irq-disabled context since it is hard IRQ. There
is no necessity to do it again.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Akash Asthana <akashast@codeaurora.org>
Reviewed-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: efm32: Use devm_platform_get_and_ioremap_resource()
Wang ShaoBo [Fri, 18 Sep 2020 08:25:08 +0000 (16:25 +0800)]
i2c: efm32: Use devm_platform_get_and_ioremap_resource()

Make use of devm_platform_get_and_ioremap_resource() provided by
driver core platform instead of duplicated analogue. dev_err() is
removed because it has been done in devm_ioremap_resource().

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: i801: Add support for Intel Alder Lake PCH-S
Jarkko Nikula [Thu, 24 Sep 2020 13:52:17 +0000 (16:52 +0300)]
i2c: i801: Add support for Intel Alder Lake PCH-S

Add PCI ID of SMBus controller on Intel Alder Lake PCH-S

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: imx: Fix i.MX 7 compatible matching
Krzysztof Kozlowski [Thu, 17 Sep 2020 19:13:21 +0000 (21:13 +0200)]
dt-bindings: i2c: imx: Fix i.MX 7 compatible matching

The i.MX 7 DTSes use two compatibles so update the binding to fix
dtbs_check warnings like:

  arch/arm/boot/dts/imx7d-cl-som-imx7.dt.yaml: i2c@30a20000:
    compatible: ['fsl,imx7d-i2c', 'fsl,imx21-i2c'] is not valid under any of the given schemas (Possible causes of the failure):

  arch/arm/boot/dts/imx7d-cl-som-imx7.dt.yaml: i2c@30a20000:
    compatible: ['fsl,imx7d-i2c', 'fsl,imx21-i2c'] is too long

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: imx: Add properties and use unevaluatedProperties
Krzysztof Kozlowski [Thu, 17 Sep 2020 19:13:20 +0000 (21:13 +0200)]
dt-bindings: i2c: imx: Add properties and use unevaluatedProperties

Additional properties actually might appear (e.g. power-domains) so
describe all typical properties, reference generic i2c schema and use
unevaluatedProperties to fix dtbs_check warnings like:

  arch/arm64/boot/dts/freescale/imx8mn-evk.dt.yaml: i2c@30a20000:
    '#address-cells', '#size-cells', 'pmic@25' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: imx-lpi2c: Fix i.MX 8QXP compatible matching
Krzysztof Kozlowski [Thu, 17 Sep 2020 19:13:19 +0000 (21:13 +0200)]
dt-bindings: i2c: imx-lpi2c: Fix i.MX 8QXP compatible matching

The i.MX 8QXP DTSes use two compatibles so update the binding to fix
dtbs_check warnings like:

  arch/arm64/boot/dts/freescale/imx8qxp-mek.dt.yaml: i2c@5a820000:
    compatible: ['fsl,imx8qxp-lpi2c', 'fsl,imx7ulp-lpi2c'] is too long

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: imx-lpi2c: Add properties and use unevaluatedProperties
Krzysztof Kozlowski [Thu, 17 Sep 2020 19:13:18 +0000 (21:13 +0200)]
dt-bindings: i2c: imx-lpi2c: Add properties and use unevaluatedProperties

Additional properties actually might appear (e.g. power-domains) so
describe all typical properties, reference generic i2c schema and use
unevaluatedProperties to fix dtbs_check warnings like:

  arch/arm64/boot/dts/freescale/imx8qxp-ai_ml.dt.yaml: i2c@5a800000:
    'assigned-clock-rates', 'assigned-clocks', 'clock-names', 'power-domains' do not match any of the regexes: 'pinctrl-[0-9]+'

  arch/arm64/boot/dts/freescale/imx8qxp-colibri-eval-v3.dt.yaml: i2c@5a800000:
    'touchscreen@2c' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: imx: Fix external abort on interrupt in exit paths
Krzysztof Kozlowski [Sun, 20 Sep 2020 21:12:38 +0000 (23:12 +0200)]
i2c: imx: Fix external abort on interrupt in exit paths

If interrupt comes late, during probe error path or device remove (could
be triggered with CONFIG_DEBUG_SHIRQ), the interrupt handler
i2c_imx_isr() will access registers with the clock being disabled.  This
leads to external abort on non-linefetch on Toradex Colibri VF50 module
(with Vybrid VF5xx):

    Unhandled fault: external abort on non-linefetch (0x1008) at 0x8882d003
    Internal error: : 1008 [#1] ARM
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper Not tainted 5.7.0 #607
    Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
      (i2c_imx_isr) from [<8017009c>] (free_irq+0x25c/0x3b0)
      (free_irq) from [<805844ec>] (release_nodes+0x178/0x284)
      (release_nodes) from [<80580030>] (really_probe+0x10c/0x348)
      (really_probe) from [<80580380>] (driver_probe_device+0x60/0x170)
      (driver_probe_device) from [<80580630>] (device_driver_attach+0x58/0x60)
      (device_driver_attach) from [<805806bc>] (__driver_attach+0x84/0xc0)
      (__driver_attach) from [<8057e228>] (bus_for_each_dev+0x68/0xb4)
      (bus_for_each_dev) from [<8057f3ec>] (bus_add_driver+0x144/0x1ec)
      (bus_add_driver) from [<80581320>] (driver_register+0x78/0x110)
      (driver_register) from [<8010213c>] (do_one_initcall+0xa8/0x2f4)
      (do_one_initcall) from [<80c0100c>] (kernel_init_freeable+0x178/0x1dc)
      (kernel_init_freeable) from [<80807048>] (kernel_init+0x8/0x110)
      (kernel_init) from [<80100114>] (ret_from_fork+0x14/0x20)

Additionally, the i2c_imx_isr() could wake up the wait queue
(imx_i2c_struct->queue) before its initialization happens.

The resource-managed framework should not be used for interrupt handling,
because the resource will be released too late - after disabling clocks.
The interrupt handler is not prepared for such case.

Fixes: 1c4b6c3bcf30 ("i2c: imx: implement bus recovery")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: rk3x: Simplify with dev_err_probe()
Krzysztof Kozlowski [Wed, 2 Sep 2020 15:06:41 +0000 (17:06 +0200)]
i2c: rk3x: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC
Khalil Blaiech [Tue, 22 Sep 2020 22:49:37 +0000 (18:49 -0400)]
i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC

Add BlueField I2C driver to offer master and slave support for
Mellanox BlueField SoCs. The driver implements an SMBus adapter
and interfaces to multiple busses that can be probed using both
ACPI and Device Tree infrastructures.

The driver supports several SMBus operations to transfer data
back and forth from/to various I2C devices. It is mainly intended
to be consumed by userspace tools and utilities, such as i2c-tools
and decode-dimms to collect memory module information.

On the other hand, the driver has a slave function to support,
among others, an IPMB interface that requires both master and
slave functions to handle transfers between the BlueField SoC
and a board management controllers (e.g., BMC).

Signed-off-by: Khalil Blaiech <kblaiech@mellanox.com>
Reviewed-by: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: I2C binding for Mellanox BlueField SoC
Khalil Blaiech [Tue, 22 Sep 2020 22:49:38 +0000 (18:49 -0400)]
dt-bindings: i2c: I2C binding for Mellanox BlueField SoC

Add device tree bindings documentation for Mellanox BlueField
I2C SMBus controller.

Signed-off-by: Khalil Blaiech <kblaiech@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoMerge tag 'at24-updates-for-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git...
Wolfram Sang [Sun, 27 Sep 2020 13:16:24 +0000 (15:16 +0200)]
Merge tag 'at24-updates-for-v5.10' of git://git./linux/kernel/git/brgl/linux into i2c/for-5.10

at24 updates for v5.10

- add support for masking sensitive data in VAIO EEPROMs
- set the nvmem TYPE to NVMEM_TYPE_EEPROM
- add support for the new 'label' property
- set the nvmem ID to NVMEM_DEVID_AUTO by default (for backward
  compatibility) or to NVMEM_DEVID_NONE if label is defined

4 years agoeeprom: at24: Support custom device names for AT24 EEPROMs
Jon Hunter [Thu, 24 Sep 2020 13:20:39 +0000 (15:20 +0200)]
eeprom: at24: Support custom device names for AT24 EEPROMs

By using the label property, a more descriptive name can be populated
for AT24 EEPROMs NVMEM device. Update the AT24 driver to check to see
if the label property is present and if so, use this as the name for
NVMEM device. Please note that when the 'label' property is present for
the AT24 EEPROM, we do not want the NVMEM driver to append the 'devid'
to the name and so the nvmem_config.id is initialised to
NVMEM_DEVID_NONE.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
4 years agodt-bindings: eeprom: at24: Add label property for AT24
Jon Hunter [Wed, 16 Sep 2020 09:49:49 +0000 (10:49 +0100)]
dt-bindings: eeprom: at24: Add label property for AT24

Add a label property for the AT24 EEPROM to allow a custom name to be
used for identifying the EEPROM on a board. This is useful when there
is more than one EEPROM present.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
4 years agoeeprom: at24: Initialise AT24 NVMEM ID field
Jon Hunter [Thu, 24 Sep 2020 13:18:16 +0000 (15:18 +0200)]
eeprom: at24: Initialise AT24 NVMEM ID field

The AT24 EEPROM driver does not initialise the 'id' field of the
nvmem_config structure and because the entire structure is not
initialised, it ends up with a random value. This causes the NVMEM
driver to append the device 'devid' value to name of the NVMEM
device. Ideally for I2C devices such as the AT24 that already have a
unique name, we would not bother to append the 'devid'. However, given
that this has always been done for AT24 devices, we cannot remove the
'devid' as this will change the name of the userspace sysfs node for
the NVMEM device. Nonetheless we should ensure that the 'id' field of
the nvmem_config structure is initialised so that there is no chance of
a random value causes problems in the future. Therefore, set the NVMEM
config.id to NVMEM_DEVID_AUTO for AT24 EEPROMs so that the 'devid' is
always appended.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
4 years agoi2c: nvidia-gpu: Use put_unaligned_be24()
Andy Shevchenko [Thu, 16 Jul 2020 14:53:19 +0000 (17:53 +0300)]
i2c: nvidia-gpu: Use put_unaligned_be24()

This makes the driver code slightly easier to read.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ajay Gupta <ajayg@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: ismt: Add support for Intel Emmitsburg PCH
Andy Shevchenko [Mon, 15 Jun 2020 16:10:01 +0000 (19:10 +0300)]
i2c: ismt: Add support for Intel Emmitsburg PCH

Add PCI ID for the Intel Emmitsburg PCH iSMT SMBus controller.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Seth Heasley <seth.heasley@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: ismt: Describe parameters in kernel doc
Andy Shevchenko [Wed, 22 Jul 2020 13:43:55 +0000 (16:43 +0300)]
i2c: ismt: Describe parameters in kernel doc

Kernel doc validation script complains:

  CHECK   .../drivers/i2c/busses/i2c-ismt.c
.../i2c-ismt.c:182: warning: cannot understand function prototype: 'const struct pci_device_id ismt_ids[] = '
.../i2c-ismt.c:202: warning: Function parameter or member 'dev' not described in '__ismt_desc_dump'
.../i2c-ismt.c:202: warning: Function parameter or member 'desc' not described in '__ismt_desc_dump'
.../i2c-ismt.c:649: warning: cannot understand function prototype: 'const struct i2c_algorithm smbus_algorithm = '

Fix corresponding descriptions to make reader and kernel doc validator happy.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Seth Heasley <seth.heasley@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: jz4780: Remove of_match_ptr()
Paul Cercueil [Fri, 4 Sep 2020 13:11:52 +0000 (15:11 +0200)]
i2c: jz4780: Remove of_match_ptr()

CONFIG_OF is selected by CONFIG_MACH_INGENIC, therefore we don't need to
handle the case where Device Tree is not supported.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: jz4780: Add compatible string for JZ4770 SoC
Paul Cercueil [Fri, 4 Sep 2020 13:11:51 +0000 (15:11 +0200)]
i2c: jz4780: Add compatible string for JZ4770 SoC

The I2C controller in the JZ4770 SoC seems to work the exact same as in
the JZ4780 SoC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodt-bindings: i2c: ingenic: Add compatible string for the JZ4770
Paul Cercueil [Fri, 4 Sep 2020 13:11:50 +0000 (15:11 +0200)]
dt-bindings: i2c: ingenic: Add compatible string for the JZ4770

The I2C controller in the JZ4770 SoC seems to work the exact same as in
the JZ4780 SoC.

We could use "ingenic,jz4780-i2c" as a fallback string in the Device
Tree, but that would be awkward, since the JZ4780 is newer. Instead,
add a "ingenic,jz4770-i2c" string and use it as fallback for the
"ingenic,jz4780-i2c" string.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: amd_mp2: handle num is 0 input for i2c_amd_xfer
Tom Rix [Fri, 4 Sep 2020 18:06:47 +0000 (11:06 -0700)]
i2c: amd_mp2: handle num is 0 input for i2c_amd_xfer

clang static analyzer reports this problem

i2c-amd-mp2-plat.c:174:9: warning: Branch condition evaluates
  to a garbage value
        return err ? err : num;
               ^~~

err is not initialized, it depends on the being set in the
transfer loop which will not happen if num is 0.  Surveying
other master_xfer() implementations show all handle a 0 num.

Because returning 0 is expected, initialize err to 0.

Signed-off-by: Tom Rix <trix@redhat.com>
Acked-by: Elie Morisse <syniurge@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: stm32: Simplify with dev_err_probe()
Krzysztof Kozlowski [Mon, 14 Sep 2020 10:40:34 +0000 (12:40 +0200)]
i2c: stm32: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: stm32: fix error message on upon dma_request_chan & defer handling
Alain Volmat [Mon, 14 Sep 2020 10:40:33 +0000 (12:40 +0200)]
i2c: stm32: fix error message on upon dma_request_chan & defer handling

DMA usage is optional for the I2C driver. check for the -ENODEV
error in order to avoid displaying an error when no DMA
has been requested.
Cleaning up the error messages during probe, remove the additional
-EPROBE_DEFER within probe function since additional error message
doesn't give much more information than what is already reported
within the stm32_i2c_dma_request function.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agomisc: eeprom: use helper to get i2c_client from kobj
Wolfram Sang [Sat, 19 Sep 2020 06:56:15 +0000 (08:56 +0200)]
misc: eeprom: use helper to get i2c_client from kobj

Slightly easier to read.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: Switch to using the new API kobj_to_dev()
Tian Tao [Tue, 15 Sep 2020 01:38:18 +0000 (09:38 +0800)]
i2c: Switch to using the new API kobj_to_dev()

Switch to using the new API kobj_to_dev().

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: rcar: add HostNotify support
Wolfram Sang [Thu, 10 Sep 2020 09:11:18 +0000 (11:11 +0200)]
i2c: rcar: add HostNotify support

The I2C core can now utilize a slave interface to handle SMBus
HostNotify events. Enable it in this driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: add slave testunit driver
Wolfram Sang [Fri, 11 Sep 2020 07:16:58 +0000 (09:16 +0200)]
i2c: add slave testunit driver

Here is an I2C slave backend driver which allows to test some uncommon
functionalities of the I2C and SMBus world. Usually, you need specific
devices to test e.g. SMBus Host Notify and such. With this driver you
just need the slave interface of another I2C controller.

This initial version has testcases for multi-master and SMBus Host
Notify. Already planned but not yet implemented are SMBus Alert and
messages with I2C_M_RECV_LEN.

Please read the documentation for further details.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: stm32: name slave slot to ease maintenance
Alain Volmat [Tue, 15 Sep 2020 09:11:41 +0000 (11:11 +0200)]
i2c: stm32: name slave slot to ease maintenance

Name slave slots in order to ease code maintenance.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: bcm2835: Simplify with dev_err_probe()
Krzysztof Kozlowski [Wed, 2 Sep 2020 15:06:37 +0000 (17:06 +0200)]
i2c: bcm2835: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: mux: reg: Simplify with dev_err_probe()
Krzysztof Kozlowski [Wed, 2 Sep 2020 15:06:43 +0000 (17:06 +0200)]
i2c: mux: reg: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: mux: gpmux: Simplify with dev_err_probe()
Krzysztof Kozlowski [Wed, 2 Sep 2020 15:06:42 +0000 (17:06 +0200)]
i2c: mux: gpmux: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: rcar: refactor and shorten timeout when resetting
Wolfram Sang [Sat, 29 Aug 2020 20:38:10 +0000 (22:38 +0200)]
i2c: rcar: refactor and shorten timeout when resetting

LOOP_TIMEOUT was only used back then because we didn't want to introduce
another constant. The timeout value can easily be a magnitude shorter
because the typical range is 3us - 8us. Refactor the code to use the
poll_timeout helper, use a specific timeout value and get rid of the
ugly LOOP_TIMEOUT constant.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: rcar: improve bus busy detection
Wolfram Sang [Sat, 29 Aug 2020 20:38:09 +0000 (22:38 +0200)]
i2c: rcar: improve bus busy detection

I2C doesn't define a timeout for bus busy, so an arbitrary value like
LOOP_TIMEOUT is not a good idea. Let's use the timeout value in struct
adapter which is meant for such cases and is user-configurable (via
IOCTL). To reduce the load, wait 10us instead of 1us which is good
enough for the slow frequencies used by I2C. Finally, use the
poll_timeout helper instead of open coding it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: stm32f7: Add SMBus Host-Notify protocol support
Alain Volmat [Mon, 3 Aug 2020 05:17:56 +0000 (07:17 +0200)]
i2c: stm32f7: Add SMBus Host-Notify protocol support

Rely on the core functions to implement the host-notify
protocol via the a I2C slave device.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoeeprom: at24: set type id as EEPROM
Vadym Kochan [Wed, 16 Sep 2020 17:09:31 +0000 (20:09 +0300)]
eeprom: at24: set type id as EEPROM

Set type as NVMEM_TYPE_EEPROM to expose this info via
sysfs:

$ cat /sys/bus/nvmem/devices/{DEVICE}/type
EEPROM

Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
4 years agoi2c: smbus: add core function handling SMBus host-notify
Alain Volmat [Mon, 3 Aug 2020 05:17:55 +0000 (07:17 +0200)]
i2c: smbus: add core function handling SMBus host-notify

SMBus Host-Notify protocol, from the adapter point of view
consist of receiving a message from a client, including the
client address and some other data.

It can be simply handled by creating a new slave device
and registering a callback performing the parsing of the
message received from the client.

This commit introduces two new core functions
  * i2c_new_slave_host_notify_device
  * i2c_free_slave_host_notify_device
that take care of registration of the new slave device and
callback and will call i2c_handle_smbus_host_notify once a
Host-Notify event is received.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: add binding to mark a bus as SMBus
Wolfram Sang [Wed, 1 Jul 2020 21:48:30 +0000 (23:48 +0200)]
i2c: add binding to mark a bus as SMBus

SMBus is largely compatible with I2C but there are some specifics. In
case we need them on a bus, we can now use this new binding.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: imx: Use dev_err_probe() to simplify error handling
Anson Huang [Wed, 12 Aug 2020 03:45:54 +0000 (11:45 +0800)]
i2c: imx: Use dev_err_probe() to simplify error handling

dev_err_probe() can reduce code size, uniform error handling and record the
defer probe reason etc., use it to simplify the code.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: i801: Register lis3lv02d I2C device on Dell Latitude 5480
Jeffrey Lin [Wed, 2 Sep 2020 04:51:37 +0000 (00:51 -0400)]
i2c: i801: Register lis3lv02d I2C device on Dell Latitude 5480

Value of /sys/devices/platform/lis3lv02d/position when
    Horizontal:     (36,-108,-1152)
    Left elevated:  (-432,-126,-1062)
    Front elevated: (36,594,-936)
    Upside down:    (-126,-252,1098)

Signed-off-by: Jeffrey Lin <jeffrey@icurse.nl>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: rcar: Auto select RESET_CONTROLLER
Dirk Behme [Thu, 27 Aug 2020 09:23:30 +0000 (11:23 +0200)]
i2c: rcar: Auto select RESET_CONTROLLER

The i2c-rcar driver utilizes the Generic Reset Controller kernel
feature, so select the RESET_CONTROLLER option when the I2C_RCAR
option is selected with a Gen3 SoC.

Fixes: 2b16fd63059ab9 ("i2c: rcar: handle RXDMA HW behaviour on Gen3")
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
[erosca: Add "if ARCH_RCAR_GEN3" per Wolfram's request]
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: xiic: Support forcing single-master in DT
Jaakko Laine [Thu, 27 Aug 2020 14:48:48 +0000 (17:48 +0300)]
i2c: xiic: Support forcing single-master in DT

I2C master operating in multimaster mode can get stuck
indefinitely if I2C start is detected on bus, but no master
has a transaction going.

This is a weakness in I2C standard, which defines no way
to recover, since all masters are indefinitely disallowed
from interrupting the currently operating master. A start
condition can be created for example by an electromagnetic
discharge applied near physical I2C lines. Or a already
operating master could get reset immediately after sending
a start.

If it is known during device tree creation that only a single
I2C master will be present on the bus, this deadlock of the
I2C bus could be avoided in the driver by ignoring the
bus_is_busy register of the xiic, since bus can never be
reserved by any other master.

This patch adds this support for detecting single-master flag
in device tree and when provided, improves I2C reliability by
ignoring the therefore unnecessary xiic bus_is_busy register.

Error can be reproduced by pulling I2C SDA -line temporarily low
by shorting it to ground, while linux I2C master is operating on
it using the xiic driver. The application using the bus will
start receiving linux error code 16: "Device or resource busy"
indefinitely:

kernel: pca953x 0-0020: failed writing register
app: Error writing file, error: 16

With multi-master disabled device will instead receive error
code 5: "I/O error" while SDA is grounded, but recover normal
operation once short is removed.

kernel: pca953x 0-0020: failed reading register
app: Error reading file, error: 5

Signed-off-by: Jaakko Laine <ext-jaakko.laine@vaisala.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: xiic: Improve struct memory alignment
Jaakko Laine [Thu, 27 Aug 2020 14:48:47 +0000 (17:48 +0300)]
i2c: xiic: Improve struct memory alignment

xiic_i2c struct alignment causes the struct to
take more space in memory than strictly required.
Move state -member to end of struct to get less
padding.

Signed-off-by: Jaakko Laine <ext-jaakko.laine@vaisala.com>
Suggested-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: xiic: Change code alignment to 1 space only
Jaakko Laine [Thu, 27 Aug 2020 14:48:46 +0000 (17:48 +0300)]
i2c: xiic: Change code alignment to 1 space only

Alignment removed and replaced with 1 space only to
reduce need for future alignment changes affecting multiple
lines, when new variables are added.

Signed-off-by: Jaakko Laine <ext-jaakko.laine@vaisala.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoeeprom: at24: Tidy at24_read()
Jean Delvare [Tue, 25 Aug 2020 07:20:37 +0000 (09:20 +0200)]
eeprom: at24: Tidy at24_read()

The elegant code in at24_read() has the drawback that we now need
to make a copy of all parameters to pass them to the post-processing
callback function if there is one. Rewrite the loop in such a way that
the parameters are not modified, so saving them is no longer needed.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
4 years agoi2c: Remove 'default n' from busses/Kconfig
Jarkko Nikula [Thu, 20 Aug 2020 08:05:25 +0000 (11:05 +0300)]
i2c: Remove 'default n' from busses/Kconfig

The default value for a config option defaults to 'n' so it doesn't need
to be set here.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
[jdelvare: found another one]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoLinux 5.9-rc2
Linus Torvalds [Sun, 23 Aug 2020 21:08:43 +0000 (14:08 -0700)]
Linux 5.9-rc2

4 years agoMerge tag 'powerpc-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sun, 23 Aug 2020 18:37:23 +0000 (11:37 -0700)]
Merge tag 'powerpc-5.9-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Add perf support for emitting extended registers for power10.

 - A fix for CPU hotplug on pseries, where on large/loaded systems we
   may not wait long enough for the CPU to be offlined, leading to
   crashes.

 - Addition of a raw cputable entry for Power10, which is not required
   to boot, but is required to make our PMU setup work correctly in
   guests.

 - Three fixes for the recent changes on 32-bit Book3S to move modules
   into their own segment for strict RWX.

 - A fix for a recent change in our powernv PCI code that could lead to
   crashes.

 - A change to our perf interrupt accounting to avoid soft lockups when
   using some events, found by syzkaller.

 - A change in the way we handle power loss events from the hypervisor
   on pseries. We no longer immediately shut down if we're told we're
   running on a UPS.

 - A few other minor fixes.

Thanks to Alexey Kardashevskiy, Andreas Schwab, Aneesh Kumar K.V, Anju T
Sudhakar, Athira Rajeev, Christophe Leroy, Frederic Barrat, Greg Kurz,
Kajol Jain, Madhavan Srinivasan, Michael Neuling, Michael Roth,
Nageswara R Sastry, Oliver O'Halloran, Thiago Jung Bauermann,
Vaidyanathan Srinivasan, Vasant Hegde.

* tag 'powerpc-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/perf/hv-24x7: Move cpumask file to top folder of hv-24x7 driver
  powerpc/32s: Fix module loading failure when VMALLOC_END is over 0xf0000000
  powerpc/pseries: Do not initiate shutdown when system is running on UPS
  powerpc/perf: Fix soft lockups due to missed interrupt accounting
  powerpc/powernv/pci: Fix possible crash when releasing DMA resources
  powerpc/pseries/hotplug-cpu: wait indefinitely for vCPU death
  powerpc/32s: Fix is_module_segment() when MODULES_VADDR is defined
  powerpc/kasan: Fix KASAN_SHADOW_START on BOOK3S_32
  powerpc/fixmap: Fix the size of the early debug area
  powerpc/pkeys: Fix build error with PPC_MEM_KEYS disabled
  powerpc/kernel: Cleanup machine check function declarations
  powerpc: Add POWER10 raw mode cputable entry
  powerpc/perf: Add extended regs support for power10 platform
  powerpc/perf: Add support for outputting extended regs in perf intr_regs
  powerpc: Fix P10 PVR revision in /proc/cpuinfo for SMT4 cores

4 years agoMerge tag 'x86-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Aug 2020 18:21:16 +0000 (11:21 -0700)]
Merge tag 'x86-urgent-2020-08-23' of git://git./linux/kernel/git/tip/tip

Pull x86 fix from Thomas Gleixner:
 "A single fix for x86 which removes the RDPID usage from the paranoid
  entry path and unconditionally uses LSL to retrieve the CPU number.

  RDPID depends on MSR_TSX_AUX. KVM has an optmization to avoid
  expensive MRS read/writes on VMENTER/EXIT. It caches the MSR values
  and restores them either when leaving the run loop, on preemption or
  when going out to user space. MSR_TSX_AUX is part of that lazy MSR
  set, so after writing the guest value and before the lazy restore any
  exception using the paranoid entry will read the guest value and use
  it as CPU number to retrieve the GSBASE value for the current CPU when
  FSGSBASE is enabled. As RDPID is only used in that particular entry
  path, there is no reason to burden VMENTER/EXIT with two extra MSR
  writes. Remove the RDPID optimization, which is not even backed by
  numbers from the paranoid entry path instead"

* tag 'x86-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM

4 years agoMerge tag 'perf-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Aug 2020 18:15:14 +0000 (11:15 -0700)]
Merge tag 'perf-urgent-2020-08-23' of git://git./linux/kernel/git/tip/tip

Pull x86 perf fix from Thomas Gleixner:
 "A single update for perf on x86 which has support for the broken down
  bandwith counters"

* tag 'perf-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/uncore: Add BW counters for GT, IA and IO breakdown

4 years agoMerge tag 'efi-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Aug 2020 18:08:32 +0000 (11:08 -0700)]
Merge tag 'efi-urgent-2020-08-23' of git://git./linux/kernel/git/tip/tip

Pull EFI fixes from Thomas Gleixner:

 - Enforce NX on RO data in mixed EFI mode

 - Destroy workqueue in an error handling path to prevent UAF

 - Stop argument parser at '--' which is the delimiter for init

 - Treat a NULL command line pointer as empty instead of dereferncing it
   unconditionally.

 - Handle an unterminated command line correctly

 - Cleanup the 32bit code leftovers and remove obsolete documentation

* tag 'efi-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation: efi: remove description of efi=old_map
  efi/x86: Move 32-bit code into efi_32.c
  efi/libstub: Handle unterminated cmdline
  efi/libstub: Handle NULL cmdline
  efi/libstub: Stop parsing arguments at "--"
  efi: add missed destroy_workqueue when efisubsys_init fails
  efi/x86: Mark kernel rodata non-executable for mixed mode

4 years agoMerge tag 'core-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Aug 2020 18:05:47 +0000 (11:05 -0700)]
Merge tag 'core-urgent-2020-08-23' of git://git./linux/kernel/git/tip/tip

Pull entry fix from Thomas Gleixner:
 "A single bug fix for the common entry code.

  The transcription of the x86 version messed up the reload of the
  syscall number from pt_regs after ptrace and seccomp which breaks
  syscall number rewriting"

* tag 'core-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  core/entry: Respect syscall number rewrites

4 years agoMerge tag 'edac_urgent_for_v5.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 23 Aug 2020 17:57:19 +0000 (10:57 -0700)]
Merge tag 'edac_urgent_for_v5.9_rc2' of git://git./linux/kernel/git/ras/ras

Pull EDAC fix from Borislav Petkov:
 "A single fix correcting a reversed error severity determination check
  which lead to a recoverable error getting marked as fatal, by Tony
  Luck"

* tag 'edac_urgent_for_v5.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
  EDAC/{i7core,sb,pnd2,skx}: Fix error event severity

4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Sun, 23 Aug 2020 17:52:33 +0000 (10:52 -0700)]
Merge git://git./linux/kernel/git/netdev/net

Pull networking fixes from David Miller:
 "Nothing earth shattering here, lots of small fixes (f.e. missing RCU
  protection, bad ref counting, missing memset(), etc.) all over the
  place:

   1) Use get_file_rcu() in task_file iterator, from Yonghong Song.

   2) There are two ways to set remote source MAC addresses in macvlan
      driver, but only one of which validates things properly. Fix this.
      From Alvin Šipraga.

   3) Missing of_node_put() in gianfar probing, from Sumera
      Priyadarsini.

   4) Preserve device wanted feature bits across multiple netlink
      ethtool requests, from Maxim Mikityanskiy.

   5) Fix rcu_sched stall in task and task_file bpf iterators, from
      Yonghong Song.

   6) Avoid reset after device destroy in ena driver, from Shay
      Agroskin.

   7) Missing memset() in netlink policy export reallocation path, from
      Johannes Berg.

   8) Fix info leak in __smc_diag_dump(), from Peilin Ye.

   9) Decapsulate ECN properly for ipv6 in ipv4 tunnels, from Mark
      Tomlinson.

  10) Fix number of data stream negotiation in SCTP, from David Laight.

  11) Fix double free in connection tracker action module, from Alaa
      Hleihel.

  12) Don't allow empty NHA_GROUP attributes, from Nikolay Aleksandrov"

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (46 commits)
  net: nexthop: don't allow empty NHA_GROUP
  bpf: Fix two typos in uapi/linux/bpf.h
  net: dsa: b53: check for timeout
  tipc: call rcu_read_lock() in tipc_aead_encrypt_done()
  net/sched: act_ct: Fix skb double-free in tcf_ct_handle_fragments() error flow
  net: sctp: Fix negotiation of the number of data streams.
  dt-bindings: net: renesas, ether: Improve schema validation
  gre6: Fix reception with IP6_TNL_F_RCV_DSCP_COPY
  hv_netvsc: Fix the queue_mapping in netvsc_vf_xmit()
  hv_netvsc: Remove "unlikely" from netvsc_select_queue
  bpf: selftests: global_funcs: Check err_str before strstr
  bpf: xdp: Fix XDP mode when no mode flags specified
  selftests/bpf: Remove test_align leftovers
  tools/resolve_btfids: Fix sections with wrong alignment
  net/smc: Prevent kernel-infoleak in __smc_diag_dump()
  sfc: fix build warnings on 32-bit
  net: phy: mscc: Fix a couple of spelling mistakes "spcified" -> "specified"
  libbpf: Fix map index used in error message
  net: gemini: Fix missing free_netdev() in error path of gemini_ethernet_port_probe()
  net: atlantic: Use readx_poll_timeout() for large timeout
  ...

4 years agoMerge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Sun, 23 Aug 2020 00:11:38 +0000 (17:11 -0700)]
Merge branch 'work.epoll' of git://git./linux/kernel/git/viro/vfs

Pull epoll fixes from Al Viro:
 "Fix reference counting and clean up exit paths"

* 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  do_epoll_ctl(): clean the failure exits up a bit
  epoll: Keep a reference on files added to the check list

4 years agodo_epoll_ctl(): clean the failure exits up a bit
Al Viro [Sat, 22 Aug 2020 22:25:52 +0000 (18:25 -0400)]
do_epoll_ctl(): clean the failure exits up a bit

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
4 years agoepoll: Keep a reference on files added to the check list
Marc Zyngier [Wed, 19 Aug 2020 16:12:17 +0000 (17:12 +0100)]
epoll: Keep a reference on files added to the check list

When adding a new fd to an epoll, and that this new fd is an
epoll fd itself, we recursively scan the fds attached to it
to detect cycles, and add non-epool files to a "check list"
that gets subsequently parsed.

However, this check list isn't completely safe when deletions
can happen concurrently. To sidestep the issue, make sure that
a struct file placed on the check list sees its f_count increased,
ensuring that a concurrent deletion won't result in the file
disapearing from under our feet.

Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
4 years agonet: nexthop: don't allow empty NHA_GROUP
Nikolay Aleksandrov [Sat, 22 Aug 2020 12:06:36 +0000 (15:06 +0300)]
net: nexthop: don't allow empty NHA_GROUP

Currently the nexthop code will use an empty NHA_GROUP attribute, but it
requires at least 1 entry in order to function properly. Otherwise we
end up derefencing null or random pointers all over the place due to not
having any nh_grp_entry members allocated, nexthop code relies on having at
least the first member present. Empty NHA_GROUP doesn't make any sense so
just disallow it.
Also add a WARN_ON for any future users of nexthop_create_group().

 BUG: kernel NULL pointer dereference, address: 0000000000000080
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] SMP
 CPU: 0 PID: 558 Comm: ip Not tainted 5.9.0-rc1+ #93
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-2.fc32 04/01/2014
 RIP: 0010:fib_check_nexthop+0x4a/0xaa
 Code: 0f 84 83 00 00 00 48 c7 02 80 03 f7 81 c3 40 80 fe fe 75 12 b8 ea ff ff ff 48 85 d2 74 6b 48 c7 02 40 03 f7 81 c3 48 8b 40 10 <48> 8b 80 80 00 00 00 eb 36 80 78 1a 00 74 12 b8 ea ff ff ff 48 85
 RSP: 0018:ffff88807983ba00 EFLAGS: 00010213
 RAX: 0000000000000000 RBX: ffff88807983bc00 RCX: 0000000000000000
 RDX: ffff88807983bc00 RSI: 0000000000000000 RDI: ffff88807bdd0a80
 RBP: ffff88807983baf8 R08: 0000000000000dc0 R09: 000000000000040a
 R10: 0000000000000000 R11: ffff88807bdd0ae8 R12: 0000000000000000
 R13: 0000000000000000 R14: ffff88807bea3100 R15: 0000000000000001
 FS:  00007f10db393700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000080 CR3: 000000007bd0f004 CR4: 00000000003706f0
 Call Trace:
  fib_create_info+0x64d/0xaf7
  fib_table_insert+0xf6/0x581
  ? __vma_adjust+0x3b6/0x4d4
  inet_rtm_newroute+0x56/0x70
  rtnetlink_rcv_msg+0x1e3/0x20d
  ? rtnl_calcit.isra.0+0xb8/0xb8
  netlink_rcv_skb+0x5b/0xac
  netlink_unicast+0xfa/0x17b
  netlink_sendmsg+0x334/0x353
  sock_sendmsg_nosec+0xf/0x3f
  ____sys_sendmsg+0x1a0/0x1fc
  ? copy_msghdr_from_user+0x4c/0x61
  ___sys_sendmsg+0x63/0x84
  ? handle_mm_fault+0xa39/0x11b5
  ? sockfd_lookup_light+0x72/0x9a
  __sys_sendmsg+0x50/0x6e
  do_syscall_64+0x54/0xbe
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7f10dacc0bb7
 Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb cd 66 0f 1f 44 00 00 8b 05 9a 4b 2b 00 85 c0 75 2e 48 63 ff 48 63 d2 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 b1 f2 2a 00 f7 d8 64 89 02 48
 RSP: 002b:00007ffcbe628bf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
 RAX: ffffffffffffffda RBX: 00007ffcbe628f80 RCX: 00007f10dacc0bb7
 RDX: 0000000000000000 RSI: 00007ffcbe628c60 RDI: 0000000000000003
 RBP: 000000005f41099c R08: 0000000000000001 R09: 0000000000000008
 R10: 00000000000005e9 R11: 0000000000000246 R12: 0000000000000000
 R13: 0000000000000000 R14: 00007ffcbe628d70 R15: 0000563a86c6e440
 Modules linked in:
 CR2: 0000000000000080

CC: David Ahern <dsahern@gmail.com>
Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
Reported-by: syzbot+a61aa19b0c14c8770bd9@syzkaller.appspotmail.com
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge tag 'kbuild-fixes-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahi...
Linus Torvalds [Sat, 22 Aug 2020 17:22:44 +0000 (10:22 -0700)]
Merge tag 'kbuild-fixes-v5.9' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - move -Wsign-compare warning from W=2 to W=3

 - fix the keyword _restrict to __restrict in genksyms

 - fix more bugs in qconf

* tag 'kbuild-fixes-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kconfig: qconf: replace deprecated QString::sprintf() with QTextStream
  kconfig: qconf: remove redundant help in the info view
  kconfig: qconf: remove qInfo() to get back Qt4 support
  kconfig: qconf: remove unused colNr
  kconfig: qconf: fix the popup menu in the ConfigInfoView window
  kconfig: qconf: fix signal connection to invalid slots
  genksyms: keywords: Use __restrict not _restrict
  kbuild: remove redundant patterns in filter/filter-out
  extract-cert: add static to local data
  Makefile.extrawarn: Move sign-compare from W=2 to W=3

4 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Sat, 22 Aug 2020 17:17:36 +0000 (10:17 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Allow booting of late secondary CPUs affected by erratum 1418040
   (currently they are parked if none of the early CPUs are affected by
   this erratum).

 - Add the 32-bit vdso Makefile to the vdso_install rule so that 'make
   vdso_install' installs the 32-bit compat vdso when it is compiled.

 - Print a warning that untrusted guests without a CPU erratum
   workaround (Cortex-A57 832075) may deadlock the affected system.

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  ARM64: vdso32: Install vdso32 from vdso_install
  KVM: arm64: Print warning when cpu erratum can cause guests to deadlock
  arm64: Allow booting of late CPUs affected by erratum 1418040
  arm64: Move handling of erratum 1418040 into C code

4 years agoMerge tag 's390-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sat, 22 Aug 2020 17:12:49 +0000 (10:12 -0700)]
Merge tag 's390-5.9-3' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - a couple of fixes for storage key handling relevant for debugging

 - add cond_resched into potentially slow subchannels scanning loop

 - fixes for PF/VF linking and to ignore stale PCI configuration request
   events

* tag 's390-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pci: fix PF/VF linking on hot plug
  s390/pci: re-introduce zpci_remove_device()
  s390/pci: fix zpci_bus_link_virtfn()
  s390/ptrace: fix storage key handling
  s390/runtime_instrumentation: fix storage key handling
  s390/pci: ignore stale configuration request event
  s390/cio: add cond_resched() in the slow_eval_known_fn() loop

4 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sat, 22 Aug 2020 17:03:05 +0000 (10:03 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:

 - PAE and PKU bugfixes for x86

 - selftests fix for new binutils

 - MMU notifier fix for arm64

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set
  KVM: Pass MMU notifier range flags to kvm_unmap_hva_range()
  kvm: x86: Toggling CR4.PKE does not load PDPTEs in PAE mode
  kvm: x86: Toggling CR4.SMAP does not load PDPTEs in PAE mode
  KVM: x86: fix access code passed to gva_to_gpa
  selftests: kvm: Use a shorter encoding to clear RAX

4 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 22 Aug 2020 16:56:42 +0000 (09:56 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "23 fixes in 5 drivers (qla2xxx, ufs, scsi_debug, fcoe, zfcp). The bulk
  of the changes are in qla2xxx and ufs and all are mostly small and
  definitely don't impact the core"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (23 commits)
  Revert "scsi: qla2xxx: Disable T10-DIF feature with FC-NVMe during probe"
  Revert "scsi: qla2xxx: Fix crash on qla2x00_mailbox_command"
  scsi: qla2xxx: Fix null pointer access during disconnect from subsystem
  scsi: qla2xxx: Check if FW supports MQ before enabling
  scsi: qla2xxx: Fix WARN_ON in qla_nvme_register_hba
  scsi: qla2xxx: Allow ql2xextended_error_logging special value 1 to be set anytime
  scsi: qla2xxx: Reduce noisy debug message
  scsi: qla2xxx: Fix login timeout
  scsi: qla2xxx: Indicate correct supported speeds for Mezz card
  scsi: qla2xxx: Flush I/O on zone disable
  scsi: qla2xxx: Flush all sessions on zone disable
  scsi: qla2xxx: Use MBX_TOV_SECONDS for mailbox command timeout values
  scsi: scsi_debug: Fix scp is NULL errors
  scsi: zfcp: Fix use-after-free in request timeout handlers
  scsi: ufs: No need to send Abort Task if the task in DB was cleared
  scsi: ufs: Clean up completed request without interrupt notification
  scsi: ufs: Improve interrupt handling for shared interrupts
  scsi: ufs: Fix interrupt error message for shared interrupts
  scsi: ufs-pci: Add quirk for broken auto-hibernate for Intel EHL
  scsi: ufs-mediatek: Fix incorrect time to wait link status
  ...

4 years agoMerge tag 'devicetree-fixes-for-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 22 Aug 2020 16:31:11 +0000 (09:31 -0700)]
Merge tag 'devicetree-fixes-for-5.9-2' of git://git./linux/kernel/git/robh/linux

Pull devicetree fixes from Rob Herring:
 "Another set of DT fixes:

   - restore range parsing error check

   - workaround PCI range parsing with missing 'device_type' now
     required

   - correct description of 'phy-connection-type'

   - fix erroneous matching on 'snps,dw-pcie' by 'intel,lgm-pcie' schema

   - a couple of grammar and whitespace fixes

   - update Shawn Guo's email"

* tag 'devicetree-fixes-for-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: vendor-prefixes: Remove trailing whitespace
  dt-bindings: net: correct description of phy-connection-type
  dt-bindings: PCI: intel,lgm-pcie: Fix matching on all snps,dw-pcie instances
  of: address: Work around missing device_type property in pcie nodes
  dt: writing-schema: Miscellaneous grammar fixes
  dt-bindings: Use Shawn Guo's preferred e-mail for i.MX bindings
  of/address: check for invalid range.cpu_addr

4 years agodt-bindings: vendor-prefixes: Remove trailing whitespace
Geert Uytterhoeven [Wed, 19 Aug 2020 09:20:58 +0000 (11:20 +0200)]
dt-bindings: vendor-prefixes: Remove trailing whitespace

Fixes: f516fb704d02fff2 ("dt-bindings: Whitespace clean-ups in schema files")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200819092058.1526-1-geert+renesas@glider.be
Signed-off-by: Rob Herring <robh@kernel.org>
4 years agoKVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set
Will Deacon [Tue, 11 Aug 2020 10:27:25 +0000 (11:27 +0100)]
KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set

When an MMU notifier call results in unmapping a range that spans multiple
PGDs, we end up calling into cond_resched_lock() when crossing a PGD boundary,
since this avoids running into RCU stalls during VM teardown. Unfortunately,
if the VM is destroyed as a result of OOM, then blocking is not permitted
and the call to the scheduler triggers the following BUG():

 | BUG: sleeping function called from invalid context at arch/arm64/kvm/mmu.c:394
 | in_atomic(): 1, irqs_disabled(): 0, non_block: 1, pid: 36, name: oom_reaper
 | INFO: lockdep is turned off.
 | CPU: 3 PID: 36 Comm: oom_reaper Not tainted 5.8.0 #1
 | Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
 | Call trace:
 |  dump_backtrace+0x0/0x284
 |  show_stack+0x1c/0x28
 |  dump_stack+0xf0/0x1a4
 |  ___might_sleep+0x2bc/0x2cc
 |  unmap_stage2_range+0x160/0x1ac
 |  kvm_unmap_hva_range+0x1a0/0x1c8
 |  kvm_mmu_notifier_invalidate_range_start+0x8c/0xf8
 |  __mmu_notifier_invalidate_range_start+0x218/0x31c
 |  mmu_notifier_invalidate_range_start_nonblock+0x78/0xb0
 |  __oom_reap_task_mm+0x128/0x268
 |  oom_reap_task+0xac/0x298
 |  oom_reaper+0x178/0x17c
 |  kthread+0x1e4/0x1fc
 |  ret_from_fork+0x10/0x30

Use the new 'flags' argument to kvm_unmap_hva_range() to ensure that we
only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is set in the notifier
flags.

Cc: <stable@vger.kernel.org>
Fixes: 8b3405e345b5 ("kvm: arm/arm64: Fix locking for kvm_free_stage2_pgd")
Cc: Marc Zyngier <maz@kernel.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Message-Id: <20200811102725.7121-3-will@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
4 years agoKVM: Pass MMU notifier range flags to kvm_unmap_hva_range()
Will Deacon [Tue, 11 Aug 2020 10:27:24 +0000 (11:27 +0100)]
KVM: Pass MMU notifier range flags to kvm_unmap_hva_range()

The 'flags' field of 'struct mmu_notifier_range' is used to indicate
whether invalidate_range_{start,end}() are permitted to block. In the
case of kvm_mmu_notifier_invalidate_range_start(), this field is not
forwarded on to the architecture-specific implementation of
kvm_unmap_hva_range() and therefore the backend cannot sensibly decide
whether or not to block.

Add an extra 'flags' parameter to kvm_unmap_hva_range() so that
architectures are aware as to whether or not they are permitted to block.

Cc: <stable@vger.kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Message-Id: <20200811102725.7121-2-will@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
4 years agodt-bindings: net: correct description of phy-connection-type
Madalin Bucur [Thu, 20 Aug 2020 10:02:04 +0000 (13:02 +0300)]
dt-bindings: net: correct description of phy-connection-type

The phy-connection-type parameter is described in ePAPR 1.1:

Specifies interface type between the Ethernet device and a physical
layer (PHY) device. The value of this property is specific to the
implementation.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Link: https://lore.kernel.org/r/1597917724-11127-1-git-send-email-madalin.bucur@oss.nxp.com
Signed-off-by: Rob Herring <robh@kernel.org>
4 years agoMerge tag 'io_uring-5.9-2020-08-21' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 21 Aug 2020 21:59:16 +0000 (14:59 -0700)]
Merge tag 'io_uring-5.9-2020-08-21' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - Make sure the head link cancelation includes async work

 - Get rid of kiocb_wait_page_queue_init(), makes no sense to have it as
   a separate function since you moved it into io_uring itself

 - io_import_iovec cleanups (Pavel, me)

 - Use system_unbound_wq for ring exit work, to avoid spawning tons of
   these if we have tons of rings exiting at the same time

 - Fix req->flags overflow flag manipulation (Pavel)

* tag 'io_uring-5.9-2020-08-21' of git://git.kernel.dk/linux-block:
  io_uring: kill extra iovec=NULL in import_iovec()
  io_uring: comment on kfree(iovec) checks
  io_uring: fix racy req->flags modification
  io_uring: use system_unbound_wq for ring exit work
  io_uring: cleanup io_import_iovec() of pre-mapped request
  io_uring: get rid of kiocb_wait_page_queue_init()
  io_uring: find and cancel head link async work on files exit