[PATCH v17 07/17] media: uvcvideo: uvc_ioctl_(g|s)_ext_ctrls: handle NoP case

[Ricardo Ribalda <ribalda@chromium.org>]

If nothing needs to be done. Exit early.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Yunke Cao <yunkec@google.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 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;

-- 
2.48.1.362.g079036d154-goog