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path: root/drivers/scsi/libsas/sas_port.c
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Diffstat (limited to 'drivers/scsi/libsas/sas_port.c')
-rw-r--r--drivers/scsi/libsas/sas_port.c52
1 files changed, 51 insertions, 1 deletions
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index e884a8c58a0c..1398b714c018 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -39,6 +39,49 @@ static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy
return true;
}
+static void sas_resume_port(struct asd_sas_phy *phy)
+{
+ struct domain_device *dev;
+ struct asd_sas_port *port = phy->port;
+ struct sas_ha_struct *sas_ha = phy->ha;
+ struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
+
+ if (si->dft->lldd_port_formed)
+ si->dft->lldd_port_formed(phy);
+
+ if (port->suspended)
+ port->suspended = 0;
+ else {
+ /* we only need to handle "link returned" actions once */
+ return;
+ }
+
+ /* if the port came back:
+ * 1/ presume every device came back
+ * 2/ force the next revalidation to check all expander phys
+ */
+ list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+ int i, rc;
+
+ rc = sas_notify_lldd_dev_found(dev);
+ if (rc) {
+ sas_unregister_dev(port, dev);
+ continue;
+ }
+
+ if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
+ dev->ex_dev.ex_change_count = -1;
+ for (i = 0; i < dev->ex_dev.num_phys; i++) {
+ struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
+
+ phy->phy_change_count = -1;
+ }
+ }
+ }
+
+ sas_discover_event(port, DISCE_RESUME);
+}
+
/**
* sas_form_port -- add this phy to a port
* @phy: the phy of interest
@@ -58,7 +101,14 @@ static void sas_form_port(struct asd_sas_phy *phy)
if (port) {
if (!phy_is_wideport_member(port, phy))
sas_deform_port(phy, 0);
- else {
+ else if (phy->suspended) {
+ phy->suspended = 0;
+ sas_resume_port(phy);
+
+ /* phy came back, try to cancel the timeout */
+ wake_up(&sas_ha->eh_wait_q);
+ return;
+ } else {
SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
__func__, phy->id, phy->port->id,
phy->port->num_phys);