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dm mpath: rdac fix init race

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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>
This commit is contained in:
Bryn M. Reeves 2007-10-19 22:29:32 +01:00 committed by Alasdair G Kergon
parent 60812a4a99
commit c7ac86de6a
1 changed files with 8 additions and 7 deletions
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15
drivers/md/dm-mpath-rdac.c
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@ -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;
}