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media: vb2: add a new warning about pending buffers 

There's a logic at the VB2 core that produces a WARN_ON if
there are still buffers waiting to be filled. However, it doesn't
indicate what buffers are still opened, with makes harder to
identify issues inside caller drivers.

So, add a new pr_warn() pointing to such buffers. That, together
with debug instrumentation inside the drivers can make easier to
identify where the problem is.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-12-28 11:29:38 -05:00
parent 2e33dbb06d
commit 6f0e5fd391
1 changed files with 4 additions and 1 deletions
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5
drivers/media/common/videobuf/videobuf2-core.c
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@ -1658,8 +1658,11 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
*/
if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
for (i = 0; i < q->num_buffers; ++i)
if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE)
if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) {
pr_warn("driver bug: stop_streaming operation is leaving buf %p in active state\n",
q->bufs[i]);
vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR);
}
/* Must be zero now */
WARN_ON(atomic_read(&q->owned_by_drv_count));
}