[PATCH v2 1/3] media: uvcvideo: Return the number of processed controls

[Ricardo Ribalda <ribalda@chromium.org>]

If we let know our callers that we have not done anything, they will be
able to optimize their decisions.

Cc: stable@kernel.org
Fixes: b4012002f3a3 ("[media] uvcvideo: Add support for control events")
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 4e58476d305e..f2484f6d21c1 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1846,12 +1846,17 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
 	return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
 }
 
+/*
+ * Returns the number of uvc controls that have been correctly set, or a
+ * negative number if there has been an error.
+ */
 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 				  struct uvc_fh *handle,
 				  struct uvc_entity *entity,
 				  int rollback,
 				  struct uvc_control **err_ctrl)
 {
+	unsigned int processed_ctrls = 0;
 	struct uvc_control *ctrl;
 	unsigned int i;
 	int ret;
@@ -1886,6 +1891,9 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 		else
 			ret = 0;
 
+		if (!ret)
+			processed_ctrls++;
+
 		if (rollback || ret < 0)
 			memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 			       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
@@ -1904,7 +1912,7 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 			uvc_ctrl_set_handle(handle, ctrl, handle);
 	}
 
-	return 0;
+	return processed_ctrls;
 }
 
 static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity,
@@ -1951,6 +1959,7 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
 
 	if (!rollback)
 		uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
+	ret = 0;
 done:
 	mutex_unlock(&chain->ctrl_mutex);
 	return ret;

-- 
2.48.1.601.g30ceb7b040-goog