commit af11c397fd8835c70ec0bb777104e4ab98b2d660
author SandeepKsinha <sandeepksinha@gmail.com> Thu Jun 18 08:49:35 2009 +1000
committer NeilBrown <neilb@suse.de> Thu Jun 18 08:49:35 2009 +1000
tree 59371fb1f955083f890dd6434e4c2f0ab9b7a97a
parent 0894cc3066aaa3e75a99383c0d25feebf9b688ac

md linear: Protecting mddev with rcu locks to avoid races


Due to the lack of memory ordering guarantees, we may have races around
mddev->conf.

In particular, the correct contents of the structure we get from
dereferencing ->private might not be visible to this CPU yet, and
they might not be correct w.r.t mddev->raid_disks.

This patch addresses the problem using rcu protection to avoid
such race conditions.

Signed-off-by: SandeepKsinha <sandeepksinha@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>