From: Calvin Owens <calvinowens@fb.com>
Date: Fri, 14 Aug 2015 01:48:10 +0000 (-0700)
Subject: mpt2sas: Refcount fw_events and fix unsafe list usage
X-Git-Tag: omap-for-v4.3/fixes-rc1~25^2~16
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=008549f6e8a1dc4aeea4a8d64184909786b27713;p=pandora-kernel.git

mpt2sas: Refcount fw_events and fix unsafe list usage

The fw_event_work struct is concurrently referenced at shutdown, so
add a refcount to protect it, and refactor the code to use it.

Additionally, refactor _scsih_fw_event_cleanup_queue() such that it
no longer iterates over the list without holding the lock, since
_firmware_event_work() concurrently deletes items from the list.

Signed-off-by: Calvin Owens <calvinowens@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Tested-by: Chaitra Basappa <chaitra.basappa@avagotech.com>
Acked-by: Sreekanth Reddy <sreekanth.reddy@avagotech.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
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