From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Thu, 21 May 2015 04:21:08 +0000 (-0700)
Subject: target: Drop se_lun->lun_active for existing percpu lun_ref
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~8^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e37d042cfcb003b885bb4c531cd6f07f62647d1;p=pandora-kernel.git

target: Drop se_lun->lun_active for existing percpu lun_ref

With se_port_t and t10_alua_tg_pt_gp_member being absored into se_lun,
there is no need for an extra atomic_t based reference count for PR
ALL_TG_PT=1 and ALUA access state transition.

Go ahead and use the existing percpu se_lun->lun_ref instead, and
convert the two special cases to percpu_ref_tryget_live() to avoid
se_lun if transport_clear_lun_ref() has already been invoked to
shutdown the se_lun.

Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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