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Commit 5d44f5e3 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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[media] Spec: document CREATE_BUFS behavior if count == 0 



Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent f05393d2

Documentation/DocBook/media/v4l/vidioc-create-bufs.xml

+7 −1
Original line number Diff line number Diff line
@@ -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>