From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Wed, 13 Apr 2011 21:46:05 +0000 (-0700)
Subject: drbd: protect all idr accesses that might sleep with drbd_cfg_rwsem
X-Git-Tag: v3.8-rc1~78^2~18^2~268
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3fcb4908d8cce7f29cff16bbef3b08933148003;p=pandora-kernel.git

drbd: protect all idr accesses that might sleep with drbd_cfg_rwsem

With this commit the locking for all accesses to IDRs is complete:

 * Non sleeping read accesses are protected by RCU
 * sleeping read accesses are protocted by a read lock on drbd_cfg_rwsem
 * accesses that add anything are protected by a write lock
 * accesses that remove an object are protoected by a write lock
   and a call to synchronize_rcu() after it is removed from the IDR
   and before the object is actually free()ed.

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