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scsi: iscsi: Add iscsi_cls_conn refcount helpers 

[ Upstream commit b1d19e8c92cfb0ded180ef3376c20e130414e067 ]

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. Subsequent commits will then use the helpers
to fix 2 bugs in the eh code.

Link: https://lore.kernel.org/r/20210525181821.7617-11-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mike Christie 2021-05-25 13:18:03 -05:00 committed by Greg Kroah-Hartman
parent 9896b67e1b
commit 173fdf1497
3 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/scsi/libiscsi.c
View File

@ -1348,7 +1348,6 @@ 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;
@ -1357,10 +1356,8 @@ 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
@ -1370,7 +1367,7 @@ 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);

12
drivers/scsi/scsi_transport_iscsi.c
View File

@ -2308,6 +2308,18 @@ 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
*/

2
include/scsi/scsi_transport_iscsi.h
View File

@ -423,6 +423,8 @@ 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);