xhci: Fix sleeping with spin_lock_irq() held in ASmedia 1042A workaround
authorMathias Nyman <mathias.nyman@linux.intel.com>
Mon, 18 Sep 2017 14:39:17 +0000 (17:39 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 18 Sep 2017 15:10:41 +0000 (17:10 +0200)
commit4ec1cd3eeeee7ccc35681270da028dbc29ca7bbd
tree4846232141189bfc8b213bbf89830a19b37400c7
parentc6b8e79306f515b5483eb11076e0fbfc140434a8
xhci: Fix sleeping with spin_lock_irq() held in ASmedia 1042A workaround

The flow control workaround for ASM1042A xHC hosts sleeps between
register polling. The workaround gets called in several places, among
them with spin_lock_irq() held when xHC host is resumed or hoplug removed.

This was noticed as kernel panics at resume on a Dell XPS15 9550 with
TB16 thunderbolt dock.

Avoid sleeping with spin_lock_irq() held, use udelay() instead

The original workaround was added to 4.9 and 4.12 stable releases,
this patch needs to be applied to those as well.

Fixes: 9da5a1092b13 ("xhci: Bad Ethernet performance plugged in ASM1042A host")
Cc: <stable@vger.kernel.org> #4.9+
Reported-by: Jose Marino <marinoj@nso.edu>
Tested-by: Jose Marino <marinoj@nso.edu>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/pci-quirks.c