From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Mon, 30 Jul 2012 07:11:38 +0000 (+0200)
Subject: drbd: flush drbd work queue before invalidate/invalidate remote
X-Git-Tag: v3.8-rc1~78^2~18^2~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=970fbde1f1ebae0c85bbaed3de83684a58d60fad;p=pandora-kernel.git

drbd: flush drbd work queue before invalidate/invalidate remote

If you do back to back wait-sync/invalidate on a Primary in a tight loop,
during application IO load, you could trigger a race:
  kernel: block drbd6: FIXME going to queue 'set_n_write from StartingSync'
    but 'write from resync_finished' still pending?

Fix this by changing the order of the drbd_queue_work() and
the wake_up() in dec_ap_pending(), and adding the additional
drbd_flush_workqueue() before requesting the full sync.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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