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

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>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index bc08a829bc13..cc16e76a2493 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -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;
 }