[PATCH] videobuf2-core: check for q->error in vb2_core_qbuf()

[Hans Verkuil]

The vb2_core_qbuf() function didn't check if q->error was set. It is checked in
__buf_prepare(), but that function isn't called if the buffer was already
prepared before with VIDIOC_PREPARE_BUF.

So check it at the start of vb2_core_qbuf() as well.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c 
b/drivers/media/common/videobuf2/videobuf2-core.c
index d3501cd604cb..5d7946ec80d8 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1484,6 +1484,11 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int 
index, void *pb,
        struct vb2_buffer *vb;
        int ret;

+       if (q->error) {
+               dprintk(1, "fatal error occurred on queue\n");
+               return -EIO;
+       }
+
        vb = q->bufs[index];

        if ((req && q->uses_qbuf) ||