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[media] vb2: fix 'UNBALANCED' warnings when calling vb2_thread_stop()

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Stopping the vb2 thread (as used by several DVB devices) can result
in an 'UNBALANCED' warning such as this:

vb2: counters for queue ffff880407ee9828: UNBALANCED!
vb2:     setup: 1 start_streaming: 1 stop_streaming: 1
vb2:     wait_prepare: 249333 wait_finish: 249334

This is due to a race condition between stopping the thread and
calling vb2_internal_streamoff(). While I have not been able to deduce
the exact mechanism how this race condition can produce this warning,
I can see that the way the stream is stopped is likely to lead to a
race somewhere.

This patch simplifies how this is done by first ensuring that the
thread is completely stopped before cleaning up the vb2 queue. It
does that by setting threadio->stop to true, followed by a call to
vb2_queue_error() which will wake up the thread. The thread sees that
'stop' is true and it will exit.

The call to kthread_stop() waits until the thread has exited, and only
then is the queue cleaned up by calling __vb2_cleanup_fileio().

This is a much cleaner sequence and the warning has now disappeared.

Reported-by: Jurgen Kramer <gtmkramer@xs4all.nl>
Tested-by: Jurgen Kramer <gtmkramer@xs4all.nl>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v3.18 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-02-16 07:49:07 -03:00 committed by Mauro Carvalho Chehab
parent c517d838eb
commit 0e66100637
1 changed files with 3 additions and 8 deletions
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11
drivers/media/v4l2-core/videobuf2-core.c
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@ -3230,18 +3230,13 @@ int vb2_thread_stop(struct vb2_queue *q)
if (threadio == NULL)
return 0;
call_void_qop(q, wait_finish, q);
threadio->stop = true;
vb2_internal_streamoff(q, q->type);
call_void_qop(q, wait_prepare, q);
/* Wake up all pending sleeps in the thread */
vb2_queue_error(q);
err = kthread_stop(threadio->thread);
q->fileio = NULL;
fileio->req.count = 0;
vb2_reqbufs(q, &fileio->req);
kfree(fileio);
__vb2_cleanup_fileio(q);
threadio->thread = NULL;
kfree(threadio);
q->fileio = NULL;
q->threadio = NULL;
return err;
}