From 738a273806ee0568369c9bb19ef3b102f54beef4 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Fri, 8 May 2015 18:19:39 +1000
Subject: [PATCH] md/raid5: fix allocation of 'scribble' array.

As the new 'scribble' array is sized based on chunk size,
we need to make sure the size matches the largest of 'old'
and 'new' chunk sizes when the array is undergoing reshape.

We also potentially need to resize it even when not resizing
the stripe cache, as chunk size can change without changing
number of devices.

So move the 'resize' code into a separate function, and
consider old and new sizes when allocating.

Signed-off-by: NeilBrown <neilb@suse.de>
Fixes: 46d5b785621a ("raid5: use flex_array for scribble data")
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