V4L/DVB (11574): uvcvideo: fill reserved fields with zero of VIDIOC_QUERYMENU

When querying menu items with VIDIOC_QUERYMENU the reserved field
is not set to zero as required by V4L2 API revision 0.24 [1].
Add this fill.

The patch was tested with v4l-test 0.11 [2] with CNF7129 webcam found
on EeePC 901.

References:
[1] V4L2 API specification, revision 0.24
    http://v4l2spec.bytesex.org/spec/r13317.htm#V4L2-QUERYMENU

[2] v4l-test: Test environment for Video For Linux Two API
    http://v4l-test.sourceforge.net/

[Modified by Laurent Pinchart]

Use u32 instead of __u32 in non-exported kernel code.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 43b05a7ecdce..ad7e64ff3add 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -46,6 +46,8 @@ static int uvc_v4l2_query_menu(struct uvc_video_device *video,
         struct uvc_menu_info *menu_info;
         struct uvc_control_mapping *mapping;
         struct uvc_control *ctrl;
+        u32 index = query_menu->index;
+        u32 id = query_menu->id;
 
         ctrl = uvc_find_control(video, query_menu->id, &mapping);
         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
@@ -54,6 +56,10 @@ static int uvc_v4l2_query_menu(struct uvc_video_device *video,
         if (query_menu->index >= mapping->menu_count)
                 return -EINVAL;
 
+        memset(query_menu, 0, sizeof(*query_menu));
+        query_menu->id = id;
+        query_menu->index = index;
+
         menu_info = &mapping->menu_info[query_menu->index];
         strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
         return 0;