From c7ac86de6a1bcb1b59c83e19b0d0d64a59604ade Mon Sep 17 00:00:00 2001
From: "Bryn M. Reeves" <breeves@redhat.com>
Date: Fri, 19 Oct 2007 22:29:32 +0100
Subject: [PATCH] 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>
---
drivers/md/dm-mpath-rdac.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/md/dm-mpath-rdac.c b/drivers/md/dm-mpath-rdac.c
index 16b1613457750..e04eb5c697fb8 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;
}
--
GitLab