[SCSI] iscsi regression: check for zero max session cmds

The old tools did not set max session cmds. This is a regression.
I removed the check when merging the power of 2 patch.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/libiscsi.c

@@ -1708,8 +1708,8 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
 		qdepth = ISCSI_DEF_CMD_PER_LUN;
 	}
 
-	if (!is_power_of_2(cmds_max) ||
-	    cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
+	if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
+	    cmds_max < 2) {
 		if (cmds_max != 0)
 			printk(KERN_ERR "iscsi: invalid can_queue of %d. "
 			       "can_queue must be a power of 2 and between "

drivers/scsi/scsi_transport_iscsi.c

@@ -33,7 +33,7 @@
 #define ISCSI_SESSION_ATTRS 19
 #define ISCSI_CONN_ATTRS 13
 #define ISCSI_HOST_ATTRS 4
-#define ISCSI_TRANSPORT_VERSION "2.0-868"
+#define ISCSI_TRANSPORT_VERSION "2.0-869"
 
 struct iscsi_internal {
 	int daemon_pid;