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Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull smp/hotplug fix from Thomas Gleixner:
 "The recent rework of the callback invocation missed to cleanup the
  leftovers of the operation, so under certain circumstances a
  subsequent CPU hotplug operation accesses stale data and crashes.
  Clean it up."

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Reset node state after operation
This commit is contained in:
Linus Torvalds 2017-10-22 06:54:42 -04:00
commit 5670a8471e
1 changed files with 5 additions and 0 deletions
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5
kernel/cpu.c
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@ -632,6 +632,11 @@ cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state, bool bringup,
__cpuhp_kick_ap(st);
}
/*
* Clean up the leftovers so the next hotplug operation wont use stale
* data.
*/
st->node = st->last = NULL;
return ret;
}