5.15-stable review patch. If anyone has any objections, please let me know.
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From: Ricardo Ribalda ribalda@chromium.org
[ Upstream commit d9fecd096f67a4469536e040a8a10bbfb665918b ]
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.... Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/usb/uvc/uvc_ctrl.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 7148dde023db2..6da8ce2e539dd 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1645,7 +1645,10 @@ 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_control **err_ctrl) + struct uvc_fh *handle, + struct uvc_entity *entity, + int rollback, + struct uvc_control **err_ctrl) { struct uvc_control *ctrl; unsigned int i; @@ -1692,6 +1695,10 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev, *err_ctrl = ctrl; return ret; } + + if (!rollback && handle && + ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) + ctrl->handle = handle; }
return 0; @@ -1728,8 +1735,8 @@ 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, - &err_ctrl); + ret = uvc_ctrl_commit_entity(chain->dev, handle, entity, + rollback, &err_ctrl); if (ret < 0) { if (ctrls) ctrls->error_idx = @@ -1864,9 +1871,6 @@ 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; @@ -2195,7 +2199,7 @@ int uvc_ctrl_restore_values(struct uvc_device *dev) ctrl->dirty = 1; }
- ret = uvc_ctrl_commit_entity(dev, entity, 0, NULL); + ret = uvc_ctrl_commit_entity(dev, NULL, entity, 0, NULL); if (ret < 0) return ret; }