From: Mike Christie <michael.christie@oracle.com>
To: lduncan@suse.com, cleech@redhat.com, njavali@marvell.com,
mrangankar@marvell.com, GR-QLogic-Storage-Upstream@marvell.com,
martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
jejb@linux.ibm.com
Cc: Mike Christie <michael.christie@oracle.com>
Subject: [PATCH v2 10/28] scsi: iscsi: Add iscsi_cls_conn refcount helpers
Date: Tue, 25 May 2021 13:18:03 -0500 [thread overview]
Message-ID: <20210525181821.7617-11-michael.christie@oracle.com> (raw)
In-Reply-To: <20210525181821.7617-1-michael.christie@oracle.com>
There are a couple places where we could free the iscsi_cls_conn while
it's still in use. This adds some helpers to get/put a refcount on the
struct and converts an exiting user. The next patches will then use the
helpers to fix 2 bugs in the eh code.
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
drivers/scsi/libiscsi.c | 7 ++-----
drivers/scsi/scsi_transport_iscsi.c | 12 ++++++++++++
include/scsi/scsi_transport_iscsi.h | 2 ++
3 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 2aaf83678654..ab39d7f65bbb 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1361,7 +1361,6 @@ void iscsi_session_failure(struct iscsi_session *session,
enum iscsi_err err)
{
struct iscsi_conn *conn;
- struct device *dev;
spin_lock_bh(&session->frwd_lock);
conn = session->leadconn;
@@ -1370,10 +1369,8 @@ void iscsi_session_failure(struct iscsi_session *session,
return;
}
- dev = get_device(&conn->cls_conn->dev);
+ iscsi_get_conn(conn->cls_conn);
spin_unlock_bh(&session->frwd_lock);
- if (!dev)
- return;
/*
* if the host is being removed bypass the connection
* recovery initialization because we are going to kill
@@ -1383,7 +1380,7 @@ void iscsi_session_failure(struct iscsi_session *session,
iscsi_conn_error_event(conn->cls_conn, err);
else
iscsi_conn_failure(conn, err);
- put_device(dev);
+ iscsi_put_conn(conn->cls_conn);
}
EXPORT_SYMBOL_GPL(iscsi_session_failure);
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index b8a93e607891..909134b9c313 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2457,6 +2457,18 @@ int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
}
EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
+void iscsi_put_conn(struct iscsi_cls_conn *conn)
+{
+ put_device(&conn->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_put_conn);
+
+void iscsi_get_conn(struct iscsi_cls_conn *conn)
+{
+ get_device(&conn->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_get_conn);
+
/*
* iscsi interface functions
*/
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 3974329d4d02..c5d7810fd792 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -443,6 +443,8 @@ extern void iscsi_remove_session(struct iscsi_cls_session *session);
extern void iscsi_free_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
int dd_size, uint32_t cid);
+extern void iscsi_put_conn(struct iscsi_cls_conn *conn);
+extern void iscsi_get_conn(struct iscsi_cls_conn *conn);
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
--
2.25.1
next prev parent reply other threads:[~2021-05-25 18:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 18:17 iSCSI error handler fixes v2 Mike Christie
2021-05-25 18:17 ` [PATCH v2 01/28] scsi: iscsi: Add task completion helper Mike Christie
2021-06-08 3:05 ` Martin K. Petersen
2021-05-25 18:17 ` [PATCH v2 02/28] scsi: iscsi: Stop queueing during ep_disconnect Mike Christie
2021-05-25 18:17 ` [PATCH v2 03/28] scsi: iscsi: Drop suspend calls from ep_disconnect Mike Christie
2021-05-25 18:17 ` [PATCH v2 04/28] scsi: iscsi: Force immediate failure during shutdown Mike Christie
2021-05-25 18:17 ` [PATCH v2 05/28] scsi: iscsi: Use system_unbound_wq for destroy_work Mike Christie
2021-05-25 18:17 ` [PATCH v2 06/28] scsi: iscsi: Rel ref after iscsi_lookup_endpoint Mike Christie
2021-05-25 18:18 ` [PATCH v2 07/28] scsi: iscsi: Fix in-kernel conn failure handling Mike Christie
2021-05-25 18:18 ` [PATCH v2 08/28] scsi: iscsi_tcp: Set no linger Mike Christie
2021-05-25 18:18 ` [PATCH v2 09/28] scsi: iscsi_tcp: Start socket shutdown during conn stop Mike Christie
2021-05-25 18:18 ` Mike Christie [this message]
2021-05-25 18:18 ` [PATCH v2 11/28] scsi: iscsi: Have abort handler get ref to conn Mike Christie
2021-05-25 18:18 ` [PATCH v2 12/28] scsi: iscsi: Get ref to conn during reset handling Mike Christie
2021-05-25 18:18 ` [PATCH v2 13/28] scsi: iscsi: Fix conn use after free during resets Mike Christie
2021-05-25 18:18 ` [PATCH v2 14/28] scsi: iscsi: Fix shost->max_id use Mike Christie
2021-05-25 18:18 ` [PATCH v2 15/28] scsi: iscsi: Fix completion check during abort races Mike Christie
2021-05-25 18:18 ` [PATCH v2 16/28] scsi: iscsi: Flush block work before unblock Mike Christie
2021-05-25 18:18 ` [PATCH v2 17/28] scsi: iscsi: Hold task ref during TMF timeout handling Mike Christie
2021-05-25 18:18 ` [PATCH v2 18/28] scsi: iscsi: Move pool freeing Mike Christie
2021-05-25 18:18 ` [PATCH v2 19/28] scsi: qedi: Fix null ref during abort handling Mike Christie
2021-05-25 18:18 ` [PATCH v2 20/28] scsi: qedi: Fix race during abort timeouts Mike Christie
2021-05-25 18:18 ` [PATCH v2 21/28] scsi: qedi: Fix use after free during abort cleanup Mike Christie
2021-05-25 18:18 ` [PATCH v2 22/28] scsi: qedi: Fix TMF tid allocation Mike Christie
2021-05-25 18:18 ` [PATCH v2 23/28] scsi: qedi: Use GFP_NOIO for TMF allocation Mike Christie
2021-05-25 18:18 ` [PATCH v2 24/28] scsi: qedi: Fix TMF session block/unblock use Mike Christie
2021-05-25 18:18 ` [PATCH v2 25/28] scsi: qedi: Fix cleanup " Mike Christie
2021-05-25 18:18 ` [PATCH v2 26/28] scsi: qedi: Pass send_iscsi_tmf task to abort Mike Christie
2021-05-25 18:18 ` [PATCH v2 27/28] scsi: qedi: Complete TMF works before disconnect Mike Christie
2021-05-25 18:18 ` [PATCH v2 28/28] scsi: qedi: Wake up if cmd_cleanup_req is set Mike Christie
2021-06-02 5:28 ` iSCSI error handler fixes v2 Martin K. Petersen
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