tree 97f8a258adcaa0123f143c1f5c53f178d96d76e8
parent 7659e349672bb0d378ef8d7d62bae4c53d2bdd18
author Thomas Gleixner <tglx@linutronix.de> 1222690179 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1222700954 +0200

hrtimer: fix migration of CB_IRQSAFE_NO_SOFTIRQ hrtimers

Impact: Stale timers after a CPU went offline.

commit 37bb6cb4097e29ffee970065b74499cbf10603a3
       hrtimer: unlock hrtimer_wakeup

changed the hrtimer sleeper callback mode to CB_IRQSAFE_NO_SOFTIRQ due
to locking problems. A result of this change is that when enqueue is
called for an already expired hrtimer the callback function is not
longer called directly from the enqueue code. The normal callers have
been fixed in the code, but the migration code which moves hrtimers
from a dead CPU to a live CPU was not made aware of this.

This can be fixed by checking the timer state after the call to
enqueue in the migration code.


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>