[media.git/next] media: uvcvideo: uvc_ioctl_(g|s)_ext_ctrls: handle NoP case

[media-ci]

On Mon Feb 3 11:55:43 2025 +0000, Ricardo Ribalda wrote:
> If nothing needs to be done. Exit early.
> 
> Reviewed-by: Hans de Goede <hdego...@redhat.com>
> Tested-by: Yunke Cao <yun...@google.com>
> Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
> Link: 
> https://lore.kernel.org/r/20250203-uvc-roi-v17-7-5900a9fed...@chromium.org
> Signed-off-by: Hans de Goede <hdego...@redhat.com>
> Signed-off-by: Hans Verkuil <hverk...@xs4all.nl>

Patch committed.

Thanks,
Hans Verkuil

 drivers/media/usb/uvc/uvc_v4l2.c | 6 ++++++
 1 file changed, 6 insertions(+)

---

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 9493ab375f07..4025811fb9e7 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1030,6 +1030,9 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void 
*fh,
        u32 which;
        int ret;
 
+       if (!ctrls->count)
+               return 0;
+
        switch (ctrls->which) {
        case V4L2_CTRL_WHICH_DEF_VAL:
        case V4L2_CTRL_WHICH_CUR_VAL:
@@ -1070,6 +1073,9 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh 
*handle,
        unsigned int i;
        int ret;
 
+       if (!ctrls->count)
+               return 0;
+
        ret = uvc_ctrl_check_access(chain, ctrls, ioctl);
        if (ret < 0)
                return ret;