Hello, Oleg, all, Thanks much, Oleg, these are really valuable additions: > suspicious ;) if you add a comment the patch will be even better. Great, will do. > perhaps it make sense to move this check into the "if (kfifo_is_empty())" > block. Indeed, otherwise it kinda breaks the execution logic. > is kfifo_is_empty() == T really possible here? It looks like it is not. Reads are guarded by read_mutex and the only other code which touches hid_debug_fifo is writer. I will post v2 here soon. Lets see if it is ready for inclusion. Best regards, Vladis Dronov | Red Hat, Inc. | Product Security | Senior Software Engineer