From: Wu Fengguang <fengguang.wu@intel.com>
Date: Tue, 17 Jan 2012 17:18:56 +0000 (-0600)
Subject: writeback: fix NULL bdi->dev in trace writeback_single_inode
X-Git-Tag: v3.2.7~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aec14f459cc9d40f9fd4a7aad2be761de084b320;p=pandora-kernel.git

writeback: fix NULL bdi->dev in trace writeback_single_inode

commit 15eb77a07c714ac80201abd0a9568888bcee6276 upstream.

bdi_prune_sb() resets sb->s_bdi to default_backing_dev_info when the
tearing down the original bdi. Fix trace_writeback_single_inode to
use sb->s_bdi=default_backing_dev_info rather than bdi->dev=NULL for a
teared down bdi.

Reported-by: Rabin Vincent <rabin@rab.in>
Tested-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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