linux-kernel - [PATCH v7 15/17] media: uvcvideo: Refactor __uvc_ctrl

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Date:   Thu, 18 Mar 2021 21:29:26 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v7 15/17] media: uvcvideo: Refactor __uvc_ctrl_commit

Take a v4l2_ext_controls instead of an array of controls, this way we
can access the error_idx in future changes.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c |  5 ++---
 drivers/media/usb/uvc/uvc_v4l2.c |  8 ++++++--
 drivers/media/usb/uvc/uvcvideo.h | 10 ++++------
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 1ec8333811bc..fb8155ca0c0d 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1664,8 +1664,7 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 }
 
 int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
-		      const struct v4l2_ext_control *xctrls,
-		      unsigned int xctrls_count)
+		      struct v4l2_ext_controls *ctrls)
 {
 	struct uvc_video_chain *chain = handle->chain;
 	struct uvc_entity *entity;
@@ -1679,7 +1678,7 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
 	}
 
 	if (!rollback)
-		uvc_ctrl_send_events(handle, xctrls, xctrls_count);
+		uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
 done:
 	mutex_unlock(&chain->ctrl_mutex);
 	return ret;
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index ddebdeb5a81b..ea2c41b04664 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1025,6 +1025,10 @@ static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 	struct uvc_fh *handle = fh;
 	struct uvc_video_chain *chain = handle->chain;
 	struct v4l2_ext_control xctrl;
+	struct v4l2_ext_controls ctrls = {
+		.count = 1,
+		.controls = &xctrl,
+	};
 	int ret;
 
 	ret = uvc_ctrl_is_accessible(chain, ctrl->id, VIDIOC_S_CTRL);
@@ -1045,7 +1049,7 @@ static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 		return ret;
 	}
 
-	ret = uvc_ctrl_commit(handle, &xctrl, 1);
+	ret = uvc_ctrl_commit(handle, &ctrls);
 	if (ret < 0)
 		return ret;
 
@@ -1149,7 +1153,7 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
 	ctrls->error_idx = 0;
 
 	if (ioctl == VIDIOC_S_EXT_CTRLS)
-		return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
+		return uvc_ctrl_commit(handle, ctrls);
 	else
 		return uvc_ctrl_rollback(handle);
 }
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index a93aeedb5499..4e7b6da3c6d2 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -887,17 +887,15 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain,
 
 int uvc_ctrl_begin(struct uvc_video_chain *chain);
 int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
-		      const struct v4l2_ext_control *xctrls,
-		      unsigned int xctrls_count);
+		      struct v4l2_ext_controls *ctrls);
 static inline int uvc_ctrl_commit(struct uvc_fh *handle,
-				  const struct v4l2_ext_control *xctrls,
-				  unsigned int xctrls_count)
+				  struct v4l2_ext_controls *ctrls)
 {
-	return __uvc_ctrl_commit(handle, 0, xctrls, xctrls_count);
+	return __uvc_ctrl_commit(handle, 0, ctrls);
 }
 static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
 {
-	return __uvc_ctrl_commit(handle, 1, NULL, 0);
+	return __uvc_ctrl_commit(handle, 1, NULL);
 }
 
 int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *xctrl);
-- 
2.31.0.rc2.261.g7f71774620-goog