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[media] videobuf2-v4l2: document two helper functions 

Document vb2_ops_wait_prepare() and vb2_ops_wait_finish(),
in order to fix those two warnings:
	Documentation/media/kapi/v4l2-dev.rst:166: WARNING: c:func reference target not found: vb2_ops_wait_prepare
	Documentation/media/kapi/v4l2-dev.rst:166: WARNING: c:func reference target not found: vb2_ops_wait_finish

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
steinar/wifi_calib_4_9_kernel
Mauro Carvalho Chehab 2016-09-08 18:12:18 -03:00
parent bf4404b482
commit dba2d12ae4
1 changed files with 15 additions and 2 deletions
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17
include/media/videobuf2-v4l2.h
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@ -268,9 +268,22 @@ unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags);
#endif
/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
/**
* vb2_ops_wait_prepare - helper function to lock a struct &vb2_queue
*
* @vq: pointer to struct vb2_queue
*
* ..note:: only use if vq->lock is non-NULL.
*/
void vb2_ops_wait_prepare(struct vb2_queue *vq);
/**
* vb2_ops_wait_finish - helper function to unlock a struct &vb2_queue
*
* @vq: pointer to struct vb2_queue
*
* ..note:: only use if vq->lock is non-NULL.
*/
void vb2_ops_wait_finish(struct vb2_queue *vq);
#endif /* _MEDIA_VIDEOBUF2_V4L2_H */