[PATCH 1/1] scsi: iscsi: fix iscsi cls conn state

[PATCH 1/1] scsi: iscsi: fix iscsi cls conn state

[Mike Christie]

In commit 9e67600ed6b8 ("scsi: iscsi: Fix race condition between login
and sync thread") I missed that libiscsi was now setting the iscsi class
state, and that patch ended up resetting the state during conn stoppage
and using the wrong state value during ep_disconnect. This patch moves
the setting of the class state to the class module and then fixes the two
issues above.

Fixes: 9e67600ed6b8 ("scsi: iscsi: Fix race condition between login and sync thread")
Cc: Gulam Mohamed <gulam.mohamed@oracle.com
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/libiscsi.c             | 26 +++-----------------------
 drivers/scsi/scsi_transport_iscsi.c | 18 +++++++++++++++---
 2 files changed, 18 insertions(+), 26 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 04633e5157e9..4834219497ee 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -3179,9 +3179,10 @@ fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
 	}
 }
 
-static void iscsi_start_session_recovery(struct iscsi_session *session,
-					 struct iscsi_conn *conn, int flag)
+void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 {
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct iscsi_session *session = conn->session;
 	int old_stop_stage;
 
 	mutex_lock(&session->eh_mutex);
@@ -3239,27 +3240,6 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
 	spin_unlock_bh(&session->frwd_lock);
 	mutex_unlock(&session->eh_mutex);
 }
-
-void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct iscsi_session *session = conn->session;
-
-	switch (flag) {
-	case STOP_CONN_RECOVER:
-		cls_conn->state = ISCSI_CONN_FAILED;
-		break;
-	case STOP_CONN_TERM:
-		cls_conn->state = ISCSI_CONN_DOWN;
-		break;
-	default:
-		iscsi_conn_printk(KERN_ERR, conn,
-				  "invalid stop flag %d\n", flag);
-		return;
-	}
-
-	iscsi_start_session_recovery(session, conn, flag);
-}
 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
 
 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index f4bf62b007a0..441f0152193f 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2474,10 +2474,22 @@ static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
 	 * it works.
 	 */
 	mutex_lock(&conn_mutex);
+	switch (flag) {
+	case STOP_CONN_RECOVER:
+		conn->state = ISCSI_CONN_FAILED;
+		break;
+	case STOP_CONN_TERM:
+		conn->state = ISCSI_CONN_DOWN;
+		break;
+	default:
+		iscsi_cls_conn_printk(KERN_ERR, conn,
+				      "invalid stop flag %d\n", flag);
+		goto unlock;
+	}
+
 	conn->transport->stop_conn(conn, flag);
-	conn->state = ISCSI_CONN_DOWN;
+unlock:
 	mutex_unlock(&conn_mutex);
-
 }
 
 static void stop_conn_work_fn(struct work_struct *work)
@@ -2968,7 +2980,7 @@ static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
 		mutex_lock(&conn->ep_mutex);
 		conn->ep = NULL;
 		mutex_unlock(&conn->ep_mutex);
-		conn->state = ISCSI_CONN_DOWN;
+		conn->state = ISCSI_CONN_FAILED;
 	}
 
 	transport->ep_disconnect(ep);
-- 
2.25.1

Re: [PATCH 1/1] scsi: iscsi: fix iscsi cls conn state

[Martin K. Petersen]

On Tue, 6 Apr 2021 12:17:46 -0500, Mike Christie wrote:

> In commit 9e67600ed6b8 ("scsi: iscsi: Fix race condition between login
> and sync thread") I missed that libiscsi was now setting the iscsi class
> state, and that patch ended up resetting the state during conn stoppage
> and using the wrong state value during ep_disconnect. This patch moves
> the setting of the class state to the class module and then fixes the two
> issues above.

Applied to 5.12/scsi-fixes, thanks!

[1/1] scsi: iscsi: fix iscsi cls conn state
      https://git.kernel.org/mkp/scsi/c/0dcf8febcb7b

-- 
Martin K. Petersen	Oracle Linux Engineering