From: Daniel Stodden <daniel.stodden@citrix.com>
Date: Sat, 7 Aug 2010 16:36:53 +0000 (+0200)
Subject: blkfront: Fix blkfront backend switch race (bdev open)
X-Git-Tag: v2.6.36-rc1~288^2~70
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=139617437aff1f0d3b57c2d7cc60e60efc8fe6c3;p=pandora-kernel.git

blkfront: Fix blkfront backend switch race (bdev open)

We need not mind if users grab a late handle on a closing disk. We
probably even should not. But we have to make sure it's not a dead
one already

Let the bdev deal with a gendisk deleted under its feet. Takes the
info mutex to decide a race against backend closing.

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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