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authorHans Verkuil <hans.verkuil@cisco.com>2012-06-22 05:47:30 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-07-06 17:29:39 -0300
commit5d44f5e3e388739f017a74e73dab2a995673915f (patch)
tree6fa9dcc9fc6c5197ae313fc7ab9dacaa29106879 /Documentation/DocBook
parentf05393d2eb45b3cc9663223c3709134ccef51290 (diff)
downloadlinux-5d44f5e3e388739f017a74e73dab2a995673915f.tar.bz2
[media] Spec: document CREATE_BUFS behavior if count == 0
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-create-bufs.xml8
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
index a2474ecb574a..5e73b1c8d095 100644
--- a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
@@ -97,7 +97,13 @@ information.</para>
<row>
<entry>__u32</entry>
<entry><structfield>count</structfield></entry>
- <entry>The number of buffers requested or granted.</entry>
+ <entry>The number of buffers requested or granted. If count == 0, then
+ <constant>VIDIOC_CREATE_BUFS</constant> will set <structfield>index</structfield>
+ to the current number of created buffers, and it will check the validity of
+ <structfield>memory</structfield> and <structfield>format.type</structfield>.
+ If those are invalid -1 is returned and errno is set to &EINVAL;,
+ otherwise <constant>VIDIOC_CREATE_BUFS</constant> returns 0. It will
+ never set errno to &EBUSY; in this particular case.</entry>
</row>
<row>
<entry>__u32</entry>