From: Roland Dreier <roland@purestorage.com>
Date: Fri, 24 Feb 2012 01:22:12 +0000 (-0800)
Subject: target: Fix 16-bit target ports for SET TARGET PORT GROUPS emulation
X-Git-Tag: firefly_0821_release~7541^2~1495
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=91e4c264a6f7b2de2fa5d996db9297e99bfb1006;p=firefly-linux-kernel-4.4.55.git

target: Fix 16-bit target ports for SET TARGET PORT GROUPS emulation

commit 33395fb8a13731c7ef7b175dbf5a4d8a6738fe6c upstream.

The old code did (MSB << 8) & 0xff, which always evaluates to 0.  Just use
get_unaligned_be16() so we don't have to worry about whether our open-coded
version is correct or not.

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

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 86b36600acb4..c9674059213e 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -30,6 +30,7 @@
 #include <linux/configfs.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
+#include <asm/unaligned.h>
 
 #include <target/target_core_base.h>
 #include <target/target_core_device.h>
@@ -238,8 +239,7 @@ int core_emulate_set_target_port_groups(struct se_cmd *cmd)
 		 * changed.
 		 */
 		if (primary) {
-			tg_pt_id = ((ptr[2] << 8) & 0xff);
-			tg_pt_id |= (ptr[3] & 0xff);
+			tg_pt_id = get_unaligned_be16(ptr + 2);
 			/*
 			 * Locate the matching target port group ID from
 			 * the global tg_pt_gp list
@@ -280,8 +280,7 @@ int core_emulate_set_target_port_groups(struct se_cmd *cmd)
 			 * the Target Port in question for the the incoming
 			 * SET_TARGET_PORT_GROUPS op.
 			 */
-			rtpi = ((ptr[2] << 8) & 0xff);
-			rtpi |= (ptr[3] & 0xff);
+			rtpi = get_unaligned_be16(ptr + 2);
 			/*
 			 * Locate the matching relative target port identifer
 			 * for the struct se_device storage object.