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[SCSI] zfcp: Increase ref counter for port open requests 

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@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin Petermann 2009-05-15 13:18:19 +02:00 committed by James Bottomley
parent dceab655d9
commit a17c585564
1 changed files with 9 additions and 3 deletions
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12
drivers/s390/scsi/zfcp_fsf.c
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@ -1402,7 +1402,7 @@ static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
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(struct zfcp_fsf_req *req)
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
out:
zfcp_port_put(port);
}
/**
@ -1476,6 +1479,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
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_action *erp_action)
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);