From: Nicholas Bellinger <nab@daterainc.com>
Date: Thu, 22 Aug 2013 22:35:45 +0000 (-0700)
Subject: target: Avoid non-existent tg_pt_gp_mem in target_alua_state_check
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=89c12cc925a7d0982dc53b743a42108acc76aef4;p=linux-beck.git

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>
---

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);