From: NeilBrown <neilb@suse.de>
Date: Thu, 11 Oct 2012 02:50:13 +0000 (+1100)
Subject: md/raid5: make sure to_read and to_write never go negative.
X-Git-Tag: v3.7-rc1~10^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ed850f356a0a422013846b5291acff08815008b;p=pandora-kernel.git

md/raid5: make sure to_read and to_write never go negative.

to_read and to_write are part of the result of analysing
a stripe before handling it.
Their use is to avoid some loops and tests if the values are
known to be zero.  Thus it is not a problem if they are a
little bit larger than they should be.

So decrementing them in handle_failed_stripe serves little value, and
due to races it could cause some loops to be skipped incorrectly.

So remove those decrements.

Reported-by: "Jianpeng Ma" <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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