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drbd: remove /proc/drbd before unregistering from netlink

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There still exists a (theoretical) race on module unload, where
/proc/drbd may still exist, but the netlink callback has been
unregistered already, allowing drbdsetup to shout without listeners,
and get no reply.

Reorder remove_proc_entry and unregister of netlink callback.
drbdsetup first checks for existence of the proc entry,
and if that is missing, won't even try to contact the module.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-11-24 10:37:35 +01:00 committed by Philipp Reisner
parent 3da127fa88
commit 17a93f3007
1 changed files with 11 additions and 2 deletions
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13
drivers/block/drbd/drbd_main.c
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@ -3174,11 +3174,20 @@ static void drbd_cleanup(void)
unregister_reboot_notifier(&drbd_notifier);
/* first remove proc,
* drbdsetup uses it's presence to detect
* whether DRBD is loaded.
* If we would get stuck in proc removal,
* but have netlink already deregistered,
* some drbdsetup commands may wait forever
* for an answer.
*/
if (drbd_proc)
remove_proc_entry("drbd", NULL);
drbd_nl_cleanup();
if (minor_table) {
if (drbd_proc)
remove_proc_entry("drbd", NULL);
i = minor_count;
while (i--)
drbd_delete_device(i);