From: Martin Petermann <martin.petermann@xxxxxxxxxx>
In rare cases, open port request might timeout, erp calls
zfcp_port_put, port gets dequeued. Now, the late returning (or
dismissed) fsf-port-open calls the fsf_port_open_handler that tries to
reference the port data structure leading to a kernel oops.
Signed-off-by: Martin Petermann <martin.petermann@xxxxxxxxxx>
Signed-off-by: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
---
drivers/s390/scsi/zfcp_fsf.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/drivers/s390/scsi/zfcp_fsf.c 2009-05-15 12:56:17.000000000 +0200
+++ b/drivers/s390/scsi/zfcp_fsf.c 2009-05-15 12:56:19.000000000 +0200
@@ -1402,7 +1402,7 @@ static void zfcp_fsf_open_port_handler(s
struct fsf_plogi *plogi;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
- return;
+ goto out;
switch (header->fsf_status) {
case FSF_PORT_ALREADY_OPEN:
@@ -1464,6 +1464,9 @@ static void zfcp_fsf_open_port_handler(s
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
+
+out:
+ zfcp_port_put(port);
}
/**
@@ -1476,6 +1479,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_a
struct qdio_buffer_element *sbale;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_fsf_req *req;
+ struct zfcp_port *port = erp_action->port;
int retval = -EIO;
spin_lock_bh(&adapter->req_q_lock);
@@ -1496,16 +1500,18 @@ int zfcp_fsf_open_port(struct zfcp_erp_a
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
req->handler = zfcp_fsf_open_port_handler;
- req->qtcb->bottom.support.d_id = erp_action->port->d_id;
- req->data = erp_action->port;
+ req->qtcb->bottom.support.d_id = port->d_id;
+ req->data = port;
req->erp_action = erp_action;
erp_action->fsf_req = req;
+ zfcp_port_get(port);
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req = NULL;
+ zfcp_port_put(port);
}
out:
spin_unlock_bh(&adapter->req_q_lock);
--
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