From: Roland Dreier <roland@purestorage.com>
Date: Wed, 20 Jul 2011 09:09:10 +0000 (+0000)
Subject: target: Make transport_lookup_cmd_lun() locking IRQ-safe
X-Git-Tag: v3.1-rc1~305^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78faae37897dc2a9ccc7c19155294a4bfdcae077;p=pandora-kernel.git

target: Make transport_lookup_cmd_lun() locking IRQ-safe

transport_lookup_cmd_lun() may be called from interrupt context (eg
tcm_loop_allocate_core_cmd() calls it, and it has a comment that says,
"Can be called from interrupt context"), so it needs to use
spin_lock_irqsave() instead of spin_lock_irq() to avoid enabling
interrupts at the wrong time.

(And indeed the last set of lock operations, on lun_cmd_lock, were
already using spin_lock_irqsave(), so we just need to fix the other
two locks we take)

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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