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scsi: iscsi: Get ref to conn during reset handling

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The comment in iscsi_eh_session_reset is wrong and we don't wait for the
EH to complete before tearing down the conn. This has us get a ref to the
conn when we are not holding the eh_mutex/frwd_lock so it does not get
freed from under us.

Link: https://lore.kernel.org/r/20210525181821.7617-13-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>
This commit is contained in:
Mike Christie 2021-05-25 13:18:05 -05:00 committed by Martin K. Petersen
parent d39df15851
commit fda290c5ae
1 changed files with 5 additions and 5 deletions
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10
drivers/scsi/libiscsi.c
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@ -2492,7 +2492,6 @@ int iscsi_eh_session_reset(struct scsi_cmnd *sc)
cls_session = starget_to_session(scsi_target(sc->device));
session = cls_session->dd_data;
conn = session->leadconn;
mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->frwd_lock);
@ -2507,13 +2506,14 @@ failed:
return FAILED;
}
conn = session->leadconn;
iscsi_get_conn(conn->cls_conn);
spin_unlock_bh(&session->frwd_lock);
mutex_unlock(&session->eh_mutex);
/*
* we drop the lock here but the leadconn cannot be destoyed while
* we are in the scsi eh
*/
iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
iscsi_put_conn(conn->cls_conn);
ISCSI_DBG_EH(session, "wait for relogin\n");
wait_event_interruptible(conn->ehwait,