[PATCH] media: vb2: Fix buf_out_validate documentation

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The .buf_out_validate callback is mandatory for OUTPUT
queues. Mark it as such in the callback's doc.

Fixes: 28d77c21cb ("media: vb2: add buf_out_validate callback")
Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
---
 include/media/videobuf2-core.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 4849b865b908..06142c1469cc 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -345,7 +345,8 @@ struct vb2_buffer {
  *			waiting for a new buffer to arrive.
  * @buf_out_validate:	called when the output buffer is prepared or queued
  *			to a request; drivers can use this to validate
- *			userspace-provided information; optional.
+ *			userspace-provided information; this is required only
+ *			for OUTPUT queues.
  * @buf_init:		called once after allocating a buffer (in MMAP case)
  *			or after acquiring a new USERPTR buffer; drivers may
  *			perform additional buffer-related initialization;
-- 
2.20.1




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