On 2018-09-02 13:03:27 [+0000], Sasha Levin wrote:
From: Sebastian Andrzej Siewior bigeasy@linutronix.de
[ Upstream commit 320905baa1dbddd3991c287432176d536e1d5b79 ]
The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives.
Cc: Hans Verkuil hans.verkuil@cisco.com Signed-off-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com
This change (among the others that do the same in different drivers) does not fix a bug; it is just needed for "other reasons". While this series uncovered a few bugs, this is not one of them. There is no need to backport this stable.
Sebastian