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authorBryn M. Reeves <breeves@redhat.com>2007-10-19 22:29:32 +0100
committerAlasdair G Kergon <agk@redhat.com>2007-10-20 02:00:57 +0100
commitc7ac86de6a1bcb1b59c83e19b0d0d64a59604ade (patch)
tree6dba24ddd057340ce8fe8ce6b887b7d6ce4f4193 /drivers/md/dm-mpath-rdac.c
parent60812a4a99b796d894d2522dc63cb0fafc3be25e (diff)
downloadop-kernel-dev-c7ac86de6a1bcb1b59c83e19b0d0d64a59604ade.zip
op-kernel-dev-c7ac86de6a1bcb1b59c83e19b0d0d64a59604ade.tar.gz
dm mpath: rdac fix init race
Re-order the initialisation of dm-rdac to avoid registering the hw handler before the workqueue has been initialised. Closes a race that would potentially give an oops. Signed-off-by: Bryn M. Reeves <breeves@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-mpath-rdac.c')
-rw-r--r--drivers/md/dm-mpath-rdac.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/md/dm-mpath-rdac.c b/drivers/md/dm-mpath-rdac.c
index 16b1613..e04eb5c 100644
--- a/drivers/md/dm-mpath-rdac.c
+++ b/drivers/md/dm-mpath-rdac.c
@@ -664,20 +664,21 @@ static struct hw_handler_type rdac_handler = {
static int __init rdac_init(void)
{
- int r = dm_register_hw_handler(&rdac_handler);
-
- if (r < 0) {
- DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
- return r;
- }
+ int r;
rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
if (!rdac_wkqd) {
DMERR("Failed to create workqueue rdac_wkqd.");
- dm_unregister_hw_handler(&rdac_handler);
return -ENOMEM;
}
+ r = dm_register_hw_handler(&rdac_handler);
+ if (r < 0) {
+ DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
+ destroy_workqueue(rdac_wkqd);
+ return r;
+ }
+
DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER);
return 0;
}
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