[SCSI] iscsi: fix 4k stack iscsi setups

When we run the xmit code from queuecomand the stack trace
gets too deep. The patch runs the xmit code from the scsi_host
work queue. This fixes 4k stack and xfs support and should
fix the st and sg stack usage bugs.

Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/iscsi_tcp.c

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index e31d350..4e4b106 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -525,7 +525,7 @@
 	__kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
 	__kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
 
-	schedule_work(&conn->xmitwork);
+	scsi_queue_work(session->host, &conn->xmitwork);
 	conn->r2t_pdus_cnt++;
 	spin_unlock(&session->lock);
 
@@ -1267,7 +1267,7 @@
 	conn->old_write_space(sk);
 	debug_tcp("iscsi_write_space: cid %d\n", conn->id);
 	clear_bit(SUSPEND_BIT, &conn->suspend_tx);
-	schedule_work(&conn->xmitwork);
+	scsi_queue_work(conn->session->host, &conn->xmitwork);
 }
 
 static void
@@ -2275,7 +2275,7 @@
 	 */
 	mutex_lock(&conn->xmitmutex);
 	if (iscsi_data_xmit(conn))
-		schedule_work(&conn->xmitwork);
+		scsi_queue_work(conn->session->host, &conn->xmitwork);
 	mutex_unlock(&conn->xmitmutex);
 }
 
@@ -2340,15 +2340,7 @@
 		session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
 	spin_unlock(&session->lock);
 
-        if (!in_interrupt() && mutex_trylock(&conn->xmitmutex)) {
-		spin_unlock_irq(host->host_lock);
-		if (iscsi_data_xmit(conn))
-			schedule_work(&conn->xmitwork);
-		mutex_unlock(&conn->xmitmutex);
-		spin_lock_irq(host->host_lock);
-	} else
-		schedule_work(&conn->xmitwork);
-
+	scsi_queue_work(host, &conn->xmitwork);
 	return 0;
 
 reject:
@@ -2942,8 +2934,7 @@
 	else
 	        __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
 
-	schedule_work(&conn->xmitwork);
-
+	scsi_queue_work(session->host, &conn->xmitwork);
 	return 0;
 }
 

drivers/scsi/scsi_transport_iscsi.c

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 45e3163..59a1c9d 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -379,6 +379,7 @@
 	shost->max_lun = transport->max_lun;
 	shost->max_cmd_len = transport->max_cmd_len;
 	shost->transportt = scsit;
+	shost->transportt->create_work_queue = 1;
 
 	if (scsi_add_host(shost, NULL))
 		goto free_host;