lkml.org 
[lkml]   [2017]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.10 93/93] pstore: Shut down worker when unregistering
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@chromium.org>

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 <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/pstore/platform.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -705,6 +705,7 @@ int pstore_register(struct pstore_info *
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);
@@ -727,6 +728,11 @@ 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)
@@ -826,7 +832,9 @@ static void pstore_timefunc(unsigned lon
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);

\
 
 \ /
  Last update: 2017-05-18 13:32    [W:0.251 / U:0.644 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site