From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Date: Wed, 29 Jul 2009 19:07:55 +0000 (+0200)
Subject: PM / Hibernate: Replace bdget call with simple atomic_inc of i_count
X-Git-Tag: v2.6.31-rc5~18^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dddac6a7b445de95515f64fdf82fe5dc36c02f26;p=pandora-kernel.git

PM / Hibernate: Replace bdget call with simple atomic_inc of i_count

Create bdgrab().  This function copies an existing reference to a
block_device.  It is safe to call from any context.

Hibernation code wishes to copy a reference to the active swap device.
Right now it calls bdget() under a spinlock, but this is wrong because
bdget() can sleep.  It doesn't need a full bdget() because we already
hold a reference to active swap devices (and the spinlock protects
against swapoff).

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---

Reading git-diff-tree failed