dm: add missing memory barrier to dm_suspend

Add memory barrier to fix atomic_read of pending value. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
git-mirror · Feb 8, 2008 · 7e5c1e8 · 7e5c1e8
1 parent df92207
commit 7e5c1e8
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
@@ -1410,6 +1410,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
 	while (1) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
+		smp_mb();
 		if (!atomic_read(&md->pending) || signal_pending(current))
 			break;