[PATCH 5.10.y] media: uvcvideo: Only save async fh if success

[Ricardo Ribalda <ribalda@chromium.org>]

Now we keep a reference to the active fh for any call to uvc_ctrl_set,
regardless if it is an actual set or if it is a just a try or if the
device refused the operation.

We should only keep the file handle if the device actually accepted
applying the operation.

Cc: stable@vger.kernel.org
Fixes: e5225c820c05 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives")
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20241203-uvc-fix-async-v6-1-26c867231118@chromium.org
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
(cherry picked from commit d9fecd096f67a4469536e040a8a10bbfb665918b)
---
 drivers/media/usb/uvc/uvc_ctrl.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index dc8d790eb911..fbd9e0073cf7 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1528,7 +1528,9 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
 }
 
 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
-	struct uvc_entity *entity, int rollback)
+				  struct uvc_fh *handle,
+				  struct uvc_entity *entity,
+				  int rollback)
 {
 	struct uvc_control *ctrl;
 	unsigned int i;
@@ -1572,6 +1574,10 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 
 		if (ret < 0)
 			return ret;
+
+		if (!rollback && handle &&
+		    ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
+			ctrl->handle = handle;
 	}
 
 	return 0;
@@ -1587,7 +1593,8 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
 
 	/* Find the control. */
 	list_for_each_entry(entity, &chain->entities, chain) {
-		ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
+		ret = uvc_ctrl_commit_entity(chain->dev, handle, entity,
+					     rollback);
 		if (ret < 0)
 			goto done;
 	}
@@ -1711,9 +1718,6 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 	mapping->set(mapping, value,
 		uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
 
-	if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
-		ctrl->handle = handle;
-
 	ctrl->dirty = 1;
 	ctrl->modified = 1;
 	return 0;
@@ -2042,7 +2046,7 @@ int uvc_ctrl_restore_values(struct uvc_device *dev)
 			ctrl->dirty = 1;
 		}
 
-		ret = uvc_ctrl_commit_entity(dev, entity, 0);
+		ret = uvc_ctrl_commit_entity(dev, NULL, entity, 0);
 		if (ret < 0)
 			return ret;
 	}
-- 
2.48.1.711.g2feabab25a-goog