openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[media] vb2: Don't WARN when v4l2_buffer.bytesused is 0 for multiplanar buffers 

Commit f61bf13b6a ("[media] vb2: add allow_zero_bytesused flag to the
vb2_queue struct") added a WARN_ONCE to catch usage of a deprecated API
using a zero value for v4l2_buffer.bytesused.

However, the condition is checked incorrectly, as the v4L2_buffer
bytesused field is supposed to be ignored for multiplanar buffers. This
results in spurious warnings when using the multiplanar API.

Fix it by checking v4l2_buffer.bytesused for uniplanar buffers and
v4l2_plane.bytesused for multiplanar buffers.

Fixes: f61bf13b6a ("[media] vb2: add allow_zero_bytesused flag to the vb2_queue struct")

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: stable@vger.kernel.org # for v4.0
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Laurent Pinchart 2015-06-19 08:50:07 -03:00 committed by Mauro Carvalho Chehab
parent 6f32a8c97f
commit 77a3c6fd90
1 changed files with 23 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/media/v4l2-core/videobuf2-core.c
View File

@ -1242,6 +1242,23 @@ void vb2_discard_done(struct vb2_queue *q)
}
EXPORT_SYMBOL_GPL(vb2_discard_done);
static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
{
static bool __check_once __read_mostly;
if (__check_once)
return;
__check_once = true;
__WARN();
pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
if (vb->vb2_queue->allow_zero_bytesused)
pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
else
pr_warn_once("use the actual size instead.\n");
}
/**
* __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
* v4l2_buffer by the userspace. The caller has already verified that struct
@ -1252,16 +1269,6 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
{
unsigned int plane;
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
if (WARN_ON_ONCE(b->bytesused == 0)) {
pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
if (vb->vb2_queue->allow_zero_bytesused)
pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
else
pr_warn_once("use the actual size instead.\n");
}
}
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
if (b->memory == V4L2_MEMORY_USERPTR) {
for (plane = 0; plane < vb->num_planes; ++plane) {
@ -1302,6 +1309,9 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
struct v4l2_plane *pdst = &v4l2_planes[plane];
struct v4l2_plane *psrc = &b->m.planes[plane];
if (psrc->bytesused == 0)
vb2_warn_zero_bytesused(vb);
if (vb->vb2_queue->allow_zero_bytesused)
pdst->bytesused = psrc->bytesused;
else
@ -1336,6 +1346,9 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
}
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
if (b->bytesused == 0)
vb2_warn_zero_bytesused(vb);
if (vb->vb2_queue->allow_zero_bytesused)
v4l2_planes[0].bytesused = b->bytesused;
else