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[media] v4l2_plane_pix_format: use __u32 bytesperline instead of __u16

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While running v4l2-compliance tests on vivid I suddenly got errors due to
a call to vmalloc_user with size 0 from vb2.

Digging deeper into the cause I discovered that this was due to the fact that
struct v4l2_plane_pix_format defines bytesperline as a __u16 instead of a __u32.

The test I was running selected a format of 4 * 4096 by 4 * 2048 with a 32
bit pixelformat.

So bytesperline was 4 * 4 * 4096 = 65536, which becomes 0 in a __u16. And
bytesperline * height is suddenly 0 as well. While the vivid driver may be
a virtual driver, it is to be expected that this limit will be hit for real
hardware as well in the near future: 8k deep-color video will already reach
it.

The solution is to change the type to __u32. The only drivers besides vivid
that use the multiplanar API are little-endian ARM and SH platforms (exynos,
ti-vpe, vsp1), so this is safe.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-03-15 14:30:25 -03:00 • committed by Mauro Carvalho Chehab
commit cc7d2dfb75
3 changed files with 5 additions and 5 deletions
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4
Documentation/DocBook/media/v4l/pixfmt.xml
View file

@ -182,14 +182,14 @@ see <xref linkend="colorspaces" />.</entry>
</entry>
</row>
<row>
<entry>__u16</entry>
<entry>__u32</entry>
<entry><structfield>bytesperline</structfield></entry>
<entry>Distance in bytes between the leftmost pixels in two adjacent
lines. See &v4l2-pix-format;.</entry>
</row>
<row>
<entry>__u16</entry>
<entry><structfield>reserved[7]</structfield></entry>
<entry><structfield>reserved[6]</structfield></entry>
<entry>Reserved for future extensions. Should be zeroed by the
application.</entry>
</row>

2
drivers/media/platform/s5p-tv/mixer_video.c
View file

@ -287,7 +287,7 @@ static void mxr_mplane_fill(struct v4l2_plane_pix_format *planes,
u32 bl_width = divup(width, blk->width);
u32 bl_height = divup(height, blk->height);
u32 sizeimage = bl_width * bl_height * blk->size;
u16 bytesperline = bl_width * blk->size / blk->height;
u32 bytesperline = bl_width * blk->size / blk->height;
plane->sizeimage += sizeimage;
plane->bytesperline = max(plane->bytesperline, bytesperline);

4
include/uapi/linux/videodev2.h
View file

@ -1842,8 +1842,8 @@ struct v4l2_mpeg_vbi_fmt_ivtv {
*/
struct v4l2_plane_pix_format {
__u32 sizeimage;
__u16 bytesperline;
__u16 reserved[7];
__u32 bytesperline;
__u16 reserved[6];
} __attribute__ ((packed));
/**