From 6746557f0325a66f57d179126426e38a8ea66945 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 26 Oct 2010 17:33:54 +1100
Subject: [PATCH] md: use bio_kmalloc rather than bio_alloc when failure is
 acceptable.

bio_alloc can never fail (as it uses a mempool) but an block
indefinitely, especially if the caller is holding a reference to a
previously allocated bio.

So these to places which both handle failure and hold multiple bios
should not use bio_alloc, they should use bio_kmalloc.

Signed-off-by: NeilBrown <neilb@suse.de>
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