[PATCH v4a 00/38] timers: Use timer_shutdown*() before freeing timers

[Jason A. Donenfeld]

On Sat, Nov 05, 2022 at 12:36:42PM -0400, Steven Rostedt wrote:
> ----------------------8<------------------------
> @@
> identifier ptr, timer, rfield, slab;
> @@
> (
> -	del_timer(&ptr->timer);
> +	timer_shutdown(&ptr->timer);
> |
> -	del_timer_sync(&ptr->timer);
> +	timer_shutdown_sync(&ptr->timer);
> )
>     ...
> (
> 	kfree_rcu(ptr, rfield);
> |
> 	kmem_cache_free(slab, ptr);
> |
> 	kfree(ptr);
> )
> ---------------------->8------------------------

Something that might help here is changing the `...` into
`... when exists` or into `... when != ptr` or similar.
See this section of the manual:
https://coccinelle.gitlabpages.inria.fr/website/docs/main_grammar004.html

Jason