From: Joe Thornber <ejt@redhat.com>
Date: Tue, 8 Apr 2014 10:08:41 +0000 (+0100)
Subject: dm thin: irqsave must always be used with the pool->lock spinlock
X-Git-Tag: omap-for-v3.16/pm-signed~18^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e3283e2920a0bd8a806964d80274b8756e0dd7f;p=pandora-kernel.git

dm thin: irqsave must always be used with the pool->lock spinlock

Commit c140e1c4e23 ("dm thin: use per thin device deferred bio lists")
incorrectly stopped disabling irqs when taking the pool's spinlock.

Irqs must be disabled when taking the pool's spinlock otherwise a thread
could spin_lock(), then get interrupted to service thin_endio() in
interrupt context, which would then deadlock in spin_lock_irqsave().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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