From 89c12cc925a7d0982dc53b743a42108acc76aef4 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@daterainc.com>
Date: Thu, 22 Aug 2013 15:35:45 -0700
Subject: [PATCH] target: Avoid non-existent tg_pt_gp_mem in
 target_alua_state_check

This patch adds an check for a non-existent port->sep_alua_tg_pt_gp_mem
within target_alua_state_check(), which is not present for internally
dispatched EXTENDED_COPY WRITE I/O to the destination target port.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Zach Brown <zab@redhat.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
---
 drivers/target/target_core_alua.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 5403186e4777..ea928c4d8854 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -557,6 +557,9 @@ target_alua_state_check(struct se_cmd *cmd)
 	 * a ALUA logical unit group.
 	 */
 	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!tg_pt_gp_mem)
+		return 0;
+
 	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 	out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
-- 
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