diff options
author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-12-20 21:45:19 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-26 00:38:09 +0300 |
commit | 292a089d78d3e2f7944e60bb897c977785a321e3 (patch) | |
tree | c9bdd3ea73fe57a35b358770998396cbc5813031 /sound/synth | |
parent | 72a85e2b0a1e1e6fb4ee51ae902730212b2de25c (diff) | |
download | linux-292a089d78d3e2f7944e60bb897c977785a321e3.tar.xz |
treewide: Convert del_timer*() to timer_shutdown*()
Due to several bugs caused by timers being re-armed after they are
shutdown and just before they are freed, a new state of timers was added
called "shutdown". After a timer is set to this state, then it can no
longer be re-armed.
The following script was run to find all the trivial locations where
del_timer() or del_timer_sync() is called in the same function that the
object holding the timer is freed. It also ignores any locations where
the timer->function is modified between the del_timer*() and the free(),
as that is not considered a "trivial" case.
This was created by using a coccinelle script and the following
commands:
$ cat timer.cocci
@@
expression ptr, slab;
identifier timer, rfield;
@@
(
- del_timer(&ptr->timer);
+ timer_shutdown(&ptr->timer);
|
- del_timer_sync(&ptr->timer);
+ timer_shutdown_sync(&ptr->timer);
)
... when strict
when != ptr->timer
(
kfree_rcu(ptr, rfield);
|
kmem_cache_free(slab, ptr);
|
kfree(ptr);
)
$ spatch timer.cocci . > /tmp/t.patch
$ patch -p1 < /tmp/t.patch
Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ]
Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ]
Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/synth')
-rw-r--r-- | sound/synth/emux/emux.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/synth/emux/emux.c b/sound/synth/emux/emux.c index a870759d179e..0006c3ddb51d 100644 --- a/sound/synth/emux/emux.c +++ b/sound/synth/emux/emux.c @@ -129,7 +129,7 @@ int snd_emux_free(struct snd_emux *emu) if (! emu) return -EINVAL; - del_timer_sync(&emu->tlist); + timer_shutdown_sync(&emu->tlist); snd_emux_proc_free(emu); snd_emux_delete_virmidi(emu); |