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authorRusty Russell <rusty@rustcorp.com.au>2008-11-17 08:22:18 +1030
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-16 15:09:52 -0800
commite14c8bf86350f6c39186a139c5c584a6111b2f01 (patch)
treec1e0b08fc5b8efff001aecf5e6fb803423bd1c71 /kernel/stop_machine.c
parent5c06fe772da43db63b053addcd2c267f76d0be91 (diff)
downloadlwn-e14c8bf86350f6c39186a139c5c584a6111b2f01.tar.gz
lwn-e14c8bf86350f6c39186a139c5c584a6111b2f01.zip
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>
Diffstat (limited to 'kernel/stop_machine.c')
-rw-r--r--kernel/stop_machine.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 9bc4c00872c9..24e8ceacc388 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -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)