diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 59e21746f550..bd90d8bacd5e 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1801,7 +1801,7 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev, unsigned int processed_ctrls = 0; struct uvc_control *ctrl; unsigned int i; - int ret; + int ret = 0; if (entity == NULL) return 0; @@ -1830,8 +1830,6 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev, dev->intfnum, ctrl->info.selector, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), ctrl->info.size); - else - ret = 0; if (!ret) processed_ctrls++; @@ -1843,17 +1841,25 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev, ctrl->dirty = 0; - if (ret < 0) { - if (err_ctrl) - *err_ctrl = ctrl; - return ret; - } - if (!rollback && handle && ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) uvc_ctrl_set_handle(handle, ctrl, handle); + + if (ret < 0 && !rollback) { + if (err_ctrl) + *err_ctrl = ctrl; + /* + * If we fail to set a control, we need to rollback + * the next ones. + */ + rollback = 1; + } + } + if (ret) + return ret; + return processed_ctrls; } @@ -1884,7 +1890,8 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, struct uvc_video_chain *chain = handle->chain; struct uvc_control *err_ctrl; struct uvc_entity *entity; - int ret = 0; + int ret_out = 0; + int ret; /* Find the control. */ list_for_each_entry(entity, &chain->entities, chain) { @@ -1895,17 +1902,23 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, ctrls->error_idx = uvc_ctrl_find_ctrl_idx(entity, ctrls, err_ctrl); - goto done; + /* + * When we fail to commit an entity, we need to + * restore the UVC_CTRL_DATA_BACKUP for all the + * controls in the other entities, otherwise our cache + * and the hardware will be out of sync. + */ + rollback = 1; + + ret_out = ret; } else if (ret > 0 && !rollback) { uvc_ctrl_send_events(handle, entity, ctrls->controls, ctrls->count); } } - ret = 0; -done: mutex_unlock(&chain->ctrl_mutex); - return ret; + return ret_out; } int uvc_ctrl_get(struct uvc_video_chain *chain,