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kernel/watchdog.c: disable nmi perf event in the error path of enabling watchdog

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In corner cases where softlockup watchdog is not setup successfully, the
relevant nmi perf event for hardlockup watchdog could be disabled, then
the status of the underlying hardware remains unchanged.

Also, if the kthread doesn't start then the hrtimer won't run and the
hardlockup detector will falsely fire.

Signed-off-by: Hillf Danton <[email protected]>
Signed-off-by: Don Zickus <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hillf Danton 2011-04-27 15:26:55 -07:00 • committed by Linus Torvalds
commit 1409f141ac
1 changed files with 4 additions and 1 deletions
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5
kernel/watchdog.c
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@ -430,9 +430,12 @@ static int watchdog_enable(int cpu)
p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
if (IS_ERR(p)) {
printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
if (!err)
if (!err) {
/* if hardlockup hasn't already set this */
err = PTR_ERR(p);
/* and disable the perf event */
watchdog_nmi_disable(cpu);
}
goto out;
}
kthread_bind(p, cpu);