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dm: add missing memory barrier to dm_suspend
author
Milan Broz
<mbroz@redhat.com>
Fri, 8 Feb 2008 02:09:49 +0000
(
02:09
+0000)
committer
Alasdair G Kergon
<agk@redhat.com>
Fri, 8 Feb 2008 02:09:49 +0000
(
02:09
+0000)
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>
drivers/md/dm.c
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diff --git
a/drivers/md/dm.c
b/drivers/md/dm.c
index f2d24eb3208c97e79bdf33b9d8c396f855f55566..466a6bf0742f98c51337735aeae732d7cac122c5 100644
(file)
--- 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;