diff options
| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-12-20 13:45:19 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-25 13:38:09 -0800 |
| commit | 292a089d78d3e2f7944e60bb897c977785a321e3 (patch) | |
| tree | c9bdd3ea73fe57a35b358770998396cbc5813031 /block | |
| parent | 72a85e2b0a1e1e6fb4ee51ae902730212b2de25c (diff) | |
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 'block')
| -rw-r--r-- | block/blk-iocost.c | 2 | ||||
| -rw-r--r-- | block/blk-iolatency.c | 2 | ||||
| -rw-r--r-- | block/kyber-iosched.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 549ddc9e0c6f..6955605629e4 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -2820,7 +2820,7 @@ static void ioc_rqos_exit(struct rq_qos *rqos) ioc->running = IOC_STOP; spin_unlock_irq(&ioc->lock); - del_timer_sync(&ioc->timer); + timer_shutdown_sync(&ioc->timer); free_percpu(ioc->pcpu_stat); kfree(ioc); } diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index 778a0057193e..ecdc10741836 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -644,7 +644,7 @@ static void blkcg_iolatency_exit(struct rq_qos *rqos) { struct blk_iolatency *blkiolat = BLKIOLATENCY(rqos); - del_timer_sync(&blkiolat->timer); + timer_shutdown_sync(&blkiolat->timer); flush_work(&blkiolat->enable_work); blkcg_deactivate_policy(rqos->q, &blkcg_policy_iolatency); kfree(blkiolat); diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c index b05357bced99..2146969237bf 100644 --- a/block/kyber-iosched.c +++ b/block/kyber-iosched.c @@ -434,7 +434,7 @@ static void kyber_exit_sched(struct elevator_queue *e) struct kyber_queue_data *kqd = e->elevator_data; int i; - del_timer_sync(&kqd->timer); + timer_shutdown_sync(&kqd->timer); blk_stat_disable_accounting(kqd->q); for (i = 0; i < KYBER_NUM_DOMAINS; i++) |