From 53cc0b2948bcb8a084982e6c1f9bd7b337e0df38 Mon Sep 17 00:00:00 2001
From: Petr Vandrovec <petr@vandrovec.name>
Date: Wed, 19 Nov 2008 11:12:14 +0100
Subject: [PATCH] When block layer fails to map iov, it calls bio_unmap_user to
 undo mapping.  Which is good if pages were mapped - but if they were provided
 by someone else and just copied then bad things happen - pages are released
 once here, and once by caller, leading to user triggerable BUG at
 include/linux/mm.h:246.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Reading git-format-patch failed