From 9ee8502bd2cc83b5c11e2f255ad233ed823d9909 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Mon, 6 Mar 2017 12:42:12 -0800 Subject: pstore: Shut down worker when unregistering commit 6330d5534786d5315d56d558aa6d20740f97d80a upstream. 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 Signed-off-by: Greg Kroah-Hartman --- fs/pstore/platform.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 14984d902a99..43033a3d66d5 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -704,6 +704,7 @@ 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); @@ -726,6 +727,11 @@ 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) @@ -825,7 +831,9 @@ 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); -- cgit v1.2.3