media: cec: avoid decrementing transmit_queue_sz if it is 0

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WARN if transmit_queue_sz is 0 but do not decrement it.
The CEC adapter will become unresponsive if it goes below
0 since then it thinks there are 4 billion messages in the
queue.

Obviously this should not happen, but a driver bug could
cause this.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: <stable@vger.kernel.org>      # for v4.12 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

...

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Hans Verkuil 2019-12-07 23:48:09 +01:00 • committed by Mauro Carvalho Chehab

parent cec935ce69

commit 95c29d46ab

1 changed files with 12 additions and 2 deletions

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drivers/media/cec/cec-adap.c

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