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stop_machine: fix race with return value (fixes Bug #11989) 

Bug #11989: Suspend failure on NForce4-based boards due to chanes in
stop_machine

We should not access active.fnret outside the lock; in theory the next
stop_machine could overwrite it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell 2008-11-17 08:22:18 +10:30 committed by Linus Torvalds
parent 5c06fe772d
commit e14c8bf863
1 changed files with 3 additions and 2 deletions
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5
kernel/stop_machine.c
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@ -112,7 +112,7 @@ static int chill(void *unused)
int __stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
{
struct work_struct *sm_work;
int i;
int i, ret;
/* Set up initial state. */
mutex_lock(&lock);
@ -137,8 +137,9 @@ int __stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
/* This will release the thread on our CPU. */
put_cpu();
flush_workqueue(stop_machine_wq);
ret = active.fnret;
mutex_unlock(&lock);
return active.fnret;
return ret;
}
int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)