From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
__vb2_queue_free() would init the queued_list at all times, even if
q->num_buffers > 0. This should only happen if num_buffers == 0.
This situation can happen if a CREATE_BUFFERS call couldn't allocate
enough buffers and had to free those it did manage to allocate before
returning an error.
While we're at it: __vb2_queue_alloc() returns the number of buffers
allocated, not an error code. So stick the result in allocated_buffers
instead of ret as that's very confusing.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-core.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 2a7815c..90374c0 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -452,9 +452,10 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
}
q->num_buffers -= buffers;
- if (!q->num_buffers)
+ if (!q->num_buffers) {
q->memory = 0;
- INIT_LIST_HEAD(&q->queued_list);
+ INIT_LIST_HEAD(&q->queued_list);
+ }
return 0;
}
@@ -820,14 +821,12 @@ static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
}
/* Finally, allocate buffers and video memory */
- ret = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes);
- if (ret == 0) {
+ allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes);
+ if (allocated_buffers == 0) {
dprintk(1, "Memory allocation failed\n");
return -ENOMEM;
}
- allocated_buffers = ret;
-
/*
* Check if driver can handle the allocated number of buffers.
*/
@@ -851,6 +850,10 @@ static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
q->num_buffers = allocated_buffers;
if (ret < 0) {
+ /*
+ * Note: __vb2_queue_free() will subtract 'allocated_buffers'
+ * from q->num_buffers.
+ */
__vb2_queue_free(q, allocated_buffers);
return ret;
}
@@ -924,20 +927,18 @@ static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create
}
/* Finally, allocate buffers and video memory */
- ret = __vb2_queue_alloc(q, create->memory, num_buffers,
+ allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers,
num_planes);
- if (ret == 0) {
+ if (allocated_buffers == 0) {
dprintk(1, "Memory allocation failed\n");
return -ENOMEM;
}
- allocated_buffers = ret;
-
/*
* Check if driver can handle the so far allocated number of buffers.
*/
- if (ret < num_buffers) {
- num_buffers = ret;
+ if (allocated_buffers < num_buffers) {
+ num_buffers = allocated_buffers;
/*
* q->num_buffers contains the total number of buffers, that the
@@ -960,6 +961,10 @@ static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create
q->num_buffers += allocated_buffers;
if (ret < 0) {
+ /*
+ * Note: __vb2_queue_free() will subtract 'allocated_buffers'
+ * from q->num_buffers.
+ */
__vb2_queue_free(q, allocated_buffers);
return -ENOMEM;
}
--
1.9.0
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
