From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Tue, 19 Jun 2012 08:27:58 +0000 (+0200)
Subject: drbd: flush drbd work queue before invalidate/invalidate remote
X-Git-Tag: v3.6-rc1~6^2~9^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ee1fb93f390f7a7231abec4e34e6ab20abeed45;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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