A follow-up to my follow-up...
I realized that it is wise to do the allocation with mmap_lock held, since that is also
held when freeing q->bufs.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
---
.../media/common/videobuf2/videobuf2-core.c | 28 +++++++++----------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index fe15e583b52a..dd25937c6dc8 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -818,7 +818,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
unsigned int i;
- int ret;
+ int ret = 0;
if (q->streaming) {
dprintk(q, 1, "streaming active\n");
@@ -859,12 +859,6 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
return 0;
}
- if (!q->bufs) {
- q->bufs = kcalloc(q->max_allowed_buffers, sizeof(*q->bufs), GFP_KERNEL);
- if (!q->bufs)
- return -ENOMEM;
- }
-
/*
* Make sure the requested values and current defaults are sane.
*/
@@ -877,8 +871,14 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
* in the queue_setup op.
*/
mutex_lock(&q->mmap_lock);
+ if (!q->bufs)
+ q->bufs = kcalloc(q->max_allowed_buffers, sizeof(*q->bufs), GFP_KERNEL);
+ if (!q->bufs)
+ ret = -ENOMEM;
q->memory = memory;
mutex_unlock(&q->mmap_lock);
+ if (ret)
+ return ret;
set_queue_coherency(q, non_coherent_mem);
/*
@@ -984,19 +984,13 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
bool no_previous_buffers = !q->num_buffers;
- int ret;
+ int ret = 0;
if (q->num_buffers == q->max_allowed_buffers) {
dprintk(q, 1, "maximum number of buffers already allocated\n");
return -ENOBUFS;
}
- if (!q->bufs) {
- q->bufs = kcalloc(q->max_allowed_buffers, sizeof(*q->bufs), GFP_KERNEL);
- if (!q->bufs)
- return -ENOMEM;
- }
-
if (no_previous_buffers) {
if (q->waiting_in_dqbuf && *count) {
dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n");
@@ -1009,7 +1003,13 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
*/
mutex_lock(&q->mmap_lock);
q->memory = memory;
+ if (!q->bufs)
+ q->bufs = kcalloc(q->max_allowed_buffers, sizeof(*q->bufs), GFP_KERNEL);
+ if (!q->bufs)
+ ret = -ENOMEM;
mutex_unlock(&q->mmap_lock);
+ if (ret)
+ return ret;
q->waiting_for_buffers = !q->is_output;
set_queue_coherency(q, non_coherent_mem);
} else {
--
2.40.1
