From: NeilBrown <neilb@suse.de>
Date: Tue, 3 Oct 2006 08:15:53 +0000 (-0700)
Subject: [PATCH] md: Improve locking around error handling
X-Git-Tag: v2.6.19-rc1~243
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c04be0aa82ff535e3676ab3e573957bdeef41879;p=pandora-kernel.git

[PATCH] md: Improve locking around error handling

The error handling routines don't use proper locking, and so two concurrent
errors could trigger a problem.

So:
  - use test-and-set and test-and-clear to synchonise
    the In_sync bits with the ->degraded count
  - use the spinlock to protect updates to the
    degraded count (could use an atomic_t but that
    would be a bigger change in code, and isn't
    really justified)
  - remove un-necessary locking in raid5

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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