[SCSI] isci: ->lldd_ata_check_ready handler

Report to libata whether the link to the given domain_device is up and the
signature fis has been received.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 29 insertions, 0 deletions

diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index c20fda090423..68d9bc23d190 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -193,6 +193,9 @@ static struct sas_domain_function_template isci_transport_ops  = {
         .lldd_lu_reset          = isci_task_lu_reset,
         .lldd_query_task        = isci_task_query_task,
 
+        /* ata recovery called from ata-eh */
+        .lldd_ata_check_ready   = isci_ata_check_ready,
+
         /* Port and Adapter management */
         .lldd_clear_nexus_port  = isci_task_clear_nexus_port,
         .lldd_clear_nexus_ha    = isci_task_clear_nexus_ha,
diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c
index e55ef65f5212..c5ae94dbef48 100644
--- a/drivers/scsi/isci/port.c
+++ b/drivers/scsi/isci/port.c
@@ -1675,6 +1675,31 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
         return ret;
 }
 
+int isci_ata_check_ready(struct domain_device *dev)
+{
+        struct isci_port *iport = dev->port->lldd_port;
+        struct isci_host *ihost = dev_to_ihost(dev);
+        struct isci_remote_device *idev;
+        unsigned long flags;
+        int rc = 0;
+
+        spin_lock_irqsave(&ihost->scic_lock, flags);
+        idev = isci_lookup_device(dev);
+        spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+        if (!idev)
+                goto out;
+
+        if (test_bit(IPORT_RESET_PENDING, &iport->state))
+                goto out;
+
+        rc = !!iport->active_phy_mask;
+ out:
+        isci_put_device(idev);
+
+        return rc;
+}
+
 void isci_port_deformed(struct asd_sas_phy *phy)
 {
         struct isci_host *ihost = phy->ha->lldd_ha;
diff --git a/drivers/scsi/isci/port.h b/drivers/scsi/isci/port.h
index a0dcdaeac3b2..321b987d582f 100644
--- a/drivers/scsi/isci/port.h
+++ b/drivers/scsi/isci/port.h
@@ -303,4 +303,5 @@ void isci_port_init(
 
 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
                                  struct isci_phy *iphy);
+int isci_ata_check_ready(struct domain_device *dev);
 #endif /* !defined(_ISCI_PORT_H_) */