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pstore: Shut down worker when unregistering 

When built as a module and running with update_ms >= 0, pstore will Oops
during module unload since the work timer is still running. This makes sure
the worker is stopped before unloading.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Kees Cook 2017-03-06 12:42:12 -08:00
parent e9a330c428
commit 6330d55347
1 changed files with 9 additions and 1 deletions
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10
fs/pstore/platform.c
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@ -709,6 +709,7 @@ int pstore_register(struct pstore_info *psi)
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_register_pmsg();
/* Start watching for new records, if desired. */
if (pstore_update_ms >= 0) {
pstore_timer.expires = jiffies +
msecs_to_jiffies(pstore_update_ms);
@ -731,6 +732,11 @@ EXPORT_SYMBOL_GPL(pstore_register);
void pstore_unregister(struct pstore_info *psi)
{
/* Stop timer and make sure all work has finished. */
pstore_update_ms = -1;
del_timer_sync(&pstore_timer);
flush_work(&pstore_work);
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_unregister_pmsg();
if (psi->flags & PSTORE_FLAGS_FTRACE)
@ -830,7 +836,9 @@ static void pstore_timefunc(unsigned long dummy)
schedule_work(&pstore_work);
}
mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
if (pstore_update_ms >= 0)
mod_timer(&pstore_timer,
jiffies + msecs_to_jiffies(pstore_update_ms));
}
module_param(backend, charp, 0444);