linux-kernel - [PATCH v16 08/18] media: uvcvideo: uvc_ioctl_(g|s)_ext

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Message-Id: <20241210-uvc-roi-v16-8-e8201f7e8e57@chromium.org>
Date: Tue, 10 Dec 2024 09:42:44 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Hans de Goede <hdegoede@...hat.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: Yunke Cao <yunkec@...omium.org>, linux-media@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>, 
 Yunke Cao <yunkec@...gle.com>
Subject: [PATCH v16 08/18] media: uvcvideo: uvc_ioctl_(g|s)_ext_ctrls:
 handle NoP case

If nothing needs to be done. Exit early.

Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Tested-by: Yunke Cao <yunkec@...gle.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.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 02fd5cbc3474..65dbb53b1e75 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1081,6 +1081,9 @@ 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:
@@ -1121,6 +1124,9 @@ 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;

-- 
2.47.0.338.g60cca15819-goog