iscsi-target: Fix processing of OOO commands

commit 3eccfdb0 upstream.

Fix two issues in OOO commands processing done at iscsit_attach_ooo_cmdsn.

Handle command serial numbers wrap around by using iscsi_sna_lt and not regular comparisson.

The routine iterates until it finds an entry whose serial number is greater than the serial number of
the new one, thus the new entry should be inserted before that entry and not after.
Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/target/iscsi/iscsi_target_erl1.c

@@ -819,7 +819,7 @@ static int iscsit_attach_ooo_cmdsn(
 		/*
 		 * CmdSN is greater than the tail of the list.
 		 */
-		if (ooo_tail->cmdsn < ooo_cmdsn->cmdsn)
+		if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn))
 			list_add_tail(&ooo_cmdsn->ooo_list,
 					&sess->sess_ooo_cmdsn_list);
 		else {
@@ -829,11 +829,12 @@ static int iscsit_attach_ooo_cmdsn(
 			 */
 			list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list,
 						ooo_list) {
-				if (ooo_tmp->cmdsn < ooo_cmdsn->cmdsn)
+				if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn))
 					continue;
 
+				/* Insert before this entry */
 				list_add(&ooo_cmdsn->ooo_list,
-					&ooo_tmp->ooo_list);
+					ooo_tmp->ooo_list.prev);
 				break;
 			}
 		}