[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>

2 files changed, 6 insertions, 14 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index e31d350e6b67..4e4b1061a5e9 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -525,7 +525,7 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
         __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 @@ iscsi_write_space(struct sock *sk)
         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 @@ iscsi_xmitworker(void *data)
          */
         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 @@ iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
                 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 @@ iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
         else
                 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
 
-        schedule_work(&conn->xmitwork);
-
+        scsi_queue_work(session->host, &conn->xmitwork);
         return 0;
 }
 
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 45e31635a595..59a1c9d9d3bd 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -379,6 +379,7 @@ iscsi_transport_create_session(struct scsi_transport_template *scsit,
         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;