[REVIEWv2 PATCH 17/34] v4l2-ctrls: return elem_size instead of strlen

[Hans Verkuil <hverkuil@xs4all.nl>]

From: Hans Verkuil <hans.verkuil@cisco.com>

When getting a string and the size given by the application is too
short return the max length the string can have (elem_size) instead
of the string length + 1. That makes more sense.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index b4a9ada..160e4c7 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1298,7 +1298,7 @@ static int ptr_to_user(struct v4l2_ext_control *c,
 	case V4L2_CTRL_TYPE_STRING:
 		len = strlen(ptr.p_char);
 		if (c->size < len + 1) {
-			c->size = len + 1;
+			c->size = ctrl->elem_size;
 			return -ENOSPC;
 		}
 		return copy_to_user(c->string, ptr.p_char, len + 1) ?
-- 
1.8.5.2