From e04ab2bc41b35c0cb6cdb07c8443f91aa738cf78 Mon Sep 17 00:00:00 2001 From: Mandeep Singh Baines Date: Sun, 22 May 2011 22:10:21 -0700 Subject: [PATCH] watchdog: Only disable/enable watchdog if neccessary Don't take any action on an unsuccessful write to /proc. Signed-off-by: Mandeep Singh Baines Cc: Marcin Slusarz Cc: Don Zickus Cc: Peter Zijlstra Cc: Frederic Weisbecker Link: http://lkml.kernel.org/r/1306127423-3347-2-git-send-email-msb@chromium.org Signed-off-by: Ingo Molnar --- kernel/watchdog.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index a06972d71060..cf0e09f452e7 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -507,15 +507,19 @@ static void watchdog_disable_all_cpus(void) int proc_dowatchdog_enabled(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { - proc_dointvec(table, write, buffer, length, ppos); + int ret; - if (write) { - if (watchdog_enabled) - watchdog_enable_all_cpus(); - else - watchdog_disable_all_cpus(); - } - return 0; + ret = proc_dointvec(table, write, buffer, length, ppos); + if (ret || !write) + goto out; + + if (watchdog_enabled) + watchdog_enable_all_cpus(); + else + watchdog_disable_all_cpus(); + +out: + return ret; } int proc_dowatchdog_thresh(struct ctl_table *table, int write, -- 2.30.2