From 886486b792e4f6f96d4fbe8ec5bf20811cab7d6a Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 3 Nov 2011 23:39:18 +0100 Subject: [PATCH] PM / Runtime: Automatically retry failed autosuspends Originally, the runtime PM core would send an idle notification whenever a suspend attempt failed. The idle callback routine could then schedule a delayed suspend for some time later. However this behavior was changed by commit f71648d73c1650b8b4aceb3856bebbde6daa3b86 (PM / Runtime: Remove idle notification after failing suspend). No notifications were sent, and there was no clear mechanism to retry failed suspends. This caused problems for the usbhid driver, because it fails autosuspend attempts as long as a key is being held down. Therefore this patch (as1492) adds a mechanism for retrying failed autosuspends. If the callback routine updates the last_busy field so that the next autosuspend expiration time is in the future, the autosuspend will automatically be rescheduled. Signed-off-by: Alan Stern Tested-by: Henrik Rydberg Cc: Signed-off-by: Rafael J. Wysocki --- Documentation/power/runtime_pm.txt | 10 ++++++++++ drivers/base/power/runtime.c | 18 ++++++++++++++++-- 2 files changed, 26 insertions(+), 2 deletions(-) diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index 0e85608..5336149 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -789,6 +789,16 @@ will behave normally, not taking the autosuspend delay into account. Similarly, if the power.use_autosuspend field isn't set then the autosuspend helper functions will behave just like the non-autosuspend counterparts. +Under some circumstances a driver or subsystem may want to prevent a device +from autosuspending immediately, even though the usage counter is zero and the +autosuspend delay time has expired. If the ->runtime_suspend() callback +returns -EAGAIN or -EBUSY, and if the next autosuspend delay expiration time is +in the future (as it normally would be if the callback invoked +pm_runtime_mark_last_busy()), the PM core will automatically reschedule the +autosuspend. The ->runtime_suspend() callback can't do this rescheduling +itself because no suspend requests of any kind are accepted while the device is +suspending (i.e., while the callback is running). + The implementation is well suited for asynchronous use in interrupt contexts. However such use inevitably involves races, because the PM core can't synchronize ->runtime_suspend() callbacks with the arrival of I/O requests. diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 18ef87e..124dbf6 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -293,6 +293,9 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev) * the callback was running then carry it out, otherwise send an idle * notification for its parent (if the suspend succeeded and both * ignore_children of parent->power and irq_safe of dev->power are not set). + * If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO + * flag is set and the next autosuspend-delay expiration time is in the + * future, schedule another autosuspend attempt. * * This function must be called under dev->power.lock with interrupts disabled. */ @@ -413,10 +416,21 @@ static int rpm_suspend(struct device *dev, int rpmflags) if (retval) { __update_runtime_status(dev, RPM_ACTIVE); dev->power.deferred_resume = false; - if (retval == -EAGAIN || retval == -EBUSY) + if (retval == -EAGAIN || retval == -EBUSY) { dev->power.runtime_error = 0; - else + + /* + * If the callback routine failed an autosuspend, and + * if the last_busy time has been updated so that there + * is a new autosuspend expiration time, automatically + * reschedule another autosuspend. + */ + if ((rpmflags & RPM_AUTO) && + pm_runtime_autosuspend_expiration(dev) != 0) + goto repeat; + } else { pm_runtime_cancel_pending(dev); + } wake_up_all(&dev->power.wait_queue); goto out; } -- 2.7.4