drbd: re-add lost conf_mutex protection in drbd_set_role
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>
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