From a7afcaccfab2fb012841852eaead79861dc9cb5f Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Mon, 24 Feb 2014 13:41:20 -0300
Subject: [PATCH] [media] vb2: don't init the list if there are still buffers
__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@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
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 ef29a220c6e22..4e5004335309b 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -456,9 +456,10 @@ 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;
}
@@ -833,14 +834,12 @@ 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.
*/
@@ -864,6 +863,10 @@ 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;
}
@@ -937,20 +940,18 @@ 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
@@ -973,6 +974,10 @@ 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;
}