]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
watchdog: update watchdog attributes atomically
authorMichal Hocko <mhocko@suse.cz>
Tue, 24 Sep 2013 22:27:29 +0000 (15:27 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 25 Sep 2013 00:00:25 +0000 (17:00 -0700)
commit359e6fab6600562073162348cd4c18c5958296d8
treea7cd07315603004dc2b00311df8cfa259b863feb
parent4a10c2ac2f368583138b774ca41fac4207911983
watchdog: update watchdog attributes atomically

proc_dowatchdog doesn't synchronize multiple callers which might lead to
confusion when two parallel callers might confuse watchdog_enable_all_cpus
resp watchdog_disable_all_cpus (eg watchdog gets enabled even if
watchdog_thresh was set to 0 already).

This patch adds a local mutex which synchronizes callers to the sysctl
handler.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/watchdog.c