[PATCH 3/3] scsi: libiscsi: get ref to conn in iscsi_eh_device/target_reset()

From: Ding Hui
Date: Thu Sep 09 2021 - 11:48:18 EST


like commit fda290c5ae98 ("scsi: iscsi: Get ref to conn during reset
handling"), because in iscsi_exec_task_mgmt_fn(), the eh_mutex and
frwd_lock will be unlock, the conn also can be released if we not
hold ref.

Signed-off-by: Ding Hui <dinghui@xxxxxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 69b3b2148328..4d3b37c20f8a 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -2398,7 +2398,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
- struct iscsi_conn *conn;
+ struct iscsi_conn *conn = NULL;
struct iscsi_tm *hdr;
int rc = FAILED;

@@ -2417,6 +2417,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
goto unlock;
conn = session->leadconn;
+ iscsi_get_conn(conn->cls_conn);

/* only have one tmf outstanding at a time */
if (session->tmf_state != TMF_INITIAL)
@@ -2463,6 +2464,8 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
done:
ISCSI_DBG_EH(session, "dev reset result = %s\n",
rc == SUCCESS ? "SUCCESS" : "FAILED");
+ if (conn)
+ iscsi_put_conn(conn->cls_conn);
mutex_unlock(&session->eh_mutex);
return rc;
}
@@ -2560,7 +2563,7 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
- struct iscsi_conn *conn;
+ struct iscsi_conn *conn = NULL;
struct iscsi_tm *hdr;
int rc = FAILED;

@@ -2579,6 +2582,7 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
goto unlock;
conn = session->leadconn;
+ iscsi_get_conn(conn->cls_conn);

/* only have one tmf outstanding at a time */
if (session->tmf_state != TMF_INITIAL)
@@ -2625,6 +2629,8 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
done:
ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
rc == SUCCESS ? "SUCCESS" : "FAILED");
+ if (conn)
+ iscsi_put_conn(conn->cls_conn);
mutex_unlock(&session->eh_mutex);
return rc;
}
--
2.17.1