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drbd: re-add lost conf_mutex protection in drbd_set_role

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The conf_update mutex used to be held while clearing the
net_conf->discard_my_data flag inside drbd_set_role.

It was moved into drbd_adm_set_role with
    drbd: allow parallel promote/demote actions
but then replaced at that location by the newly introduced adm_mutex with
    drbd: Fix a potential deadlock in drbdsetup, introduce resource->adm_mutex

And I simply forgot to put it back in at the original location.

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 2014-02-05 06:17:01 +01:00 • committed by Philipp Reisner
commit 66ce6dbce2
1 changed files with 2 additions and 2 deletions
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4
drivers/block/drbd/drbd_nl.c
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@ -661,11 +661,11 @@ drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int for
put_ldev(device);
}
} else {
/* Called from drbd_adm_set_role only.
* We are still holding the conf_update mutex. */
mutex_lock(&device->resource->conf_update);
nc = connection->net_conf;
if (nc)
nc->discard_my_data = 0; /* without copy; single bit op is atomic */
mutex_unlock(&device->resource->conf_update);
set_disk_ro(device->vdisk, false);
if (get_ldev(device)) {