[SCSI] libiscsi: use bh locking instead of irq with session lock

The session lock is taken in threads, timers, and bottom halves
like softirqs and tasklets. All the code but
iscsi_conn/session_failure take the session lock with the spin_lock_bh
call. This was done because I thought some offload drivers
would be calling these functions from a irq. They never did,
so this patch has iscsi_conn/session_failure use the bh
locking.

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

1 files changed, 6 insertions, 8 deletions

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 1def8e10124..da8b61543ee 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1338,17 +1338,16 @@ void iscsi_session_failure(struct iscsi_session *session,
 {
         struct iscsi_conn *conn;
         struct device *dev;
-        unsigned long flags;
 
-        spin_lock_irqsave(&session->lock, flags);
+        spin_lock_bh(&session->lock);
         conn = session->leadconn;
         if (session->state == ISCSI_STATE_TERMINATE || !conn) {
-                spin_unlock_irqrestore(&session->lock, flags);
+                spin_unlock_bh(&session->lock);
                 return;
         }
 
         dev = get_device(&conn->cls_conn->dev);
-        spin_unlock_irqrestore(&session->lock, flags);
+        spin_unlock_bh(&session->lock);
         if (!dev)
                 return;
         /*
@@ -1367,17 +1366,16 @@ EXPORT_SYMBOL_GPL(iscsi_session_failure);
 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
 {
         struct iscsi_session *session = conn->session;
-        unsigned long flags;
 
-        spin_lock_irqsave(&session->lock, flags);
+        spin_lock_bh(&session->lock);
         if (session->state == ISCSI_STATE_FAILED) {
-                spin_unlock_irqrestore(&session->lock, flags);
+                spin_unlock_bh(&session->lock);
                 return;
         }
 
         if (conn->stop_stage == 0)
                 session->state = ISCSI_STATE_FAILED;
-        spin_unlock_irqrestore(&session->lock, flags);
+        spin_unlock_bh(&session->lock);
 
         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);