libsas: Fix Kernel Crash in smp_execute_task

[cascardo/linux.git] / drivers / scsi / libsas / sas_discover.c

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 62b58d3..60de662 100644 (file)
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -500,6 +500,7 @@ static void sas_revalidate_domain(struct work_struct *work)
        struct sas_discovery_event *ev = to_sas_discovery_event(work);
        struct asd_sas_port *port = ev->port;
        struct sas_ha_struct *ha = port->ha;
+       struct domain_device *ddev = port->port_dev;
 
        /* prevent revalidation from finding sata links in recovery */
        mutex_lock(&ha->disco_mutex);
@@ -514,8 +515,9 @@ static void sas_revalidate_domain(struct work_struct *work)
        SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
                    task_pid_nr(current));
 
-       if (port->port_dev)
-               res = sas_ex_revalidate_domain(port->port_dev);
+       if (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
+                    ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE))
+               res = sas_ex_revalidate_domain(ddev);
 
        SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
                    port->id, task_pid_nr(current), res);