From: NeilBrown <neilb@suse.de>
Date: Tue, 26 Jul 2011 01:19:49 +0000 (+1000)
Subject: md/raid5: Remove use of sh->lock in sync_request
X-Git-Tag: v3.1-rc1~131^2~69
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83206d66b65118d995c38746f21edc2bb8564b49;p=pandora-kernel.git

md/raid5: Remove use of sh->lock in sync_request

This is the start of a series of patches to remove sh->lock.

sync_request takes sh->lock before setting STRIPE_SYNCING to ensure
there is no race with testing it in handle_stripe[56].

Instead, use a new flag STRIPE_SYNC_REQUESTED and test it early
in handle_stripe[56] (after getting the same lock) and perform the
same set/clear operations if it was set.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
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