media: chips-media: wave5: Avoid race condition in the interrupt handler

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commit ac35f76898 upstream.

In case of multiple active instances, new interrupts can occur as soon
as the current interrupt is cleared. If the driver reads the
instance_info after clearing the interrupt, then there is no guarantee,
that the instance_info is still valid for the current interrupt.

Read the instance_info register for each interrupt before clearing the
interrupt.

Fixes: ed7276ed2f ("media: chips-media: wave5: Add hrtimer based polling support")
Cc: stable@vger.kernel.org
Signed-off-by: Jackson.lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jackson.lee 2024-12-17 13:51:23 +09:00 • committed by Greg Kroah-Hartman

parent 7fafaf00cc

commit 76cab9f540

1 changed files with 2 additions and 2 deletions

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drivers/media/platform/chips-media/wave5/wave5-vpu.c

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