[PATCH] libata-hp: implement ata_eh_detach_dev()

Implement ata_eh_detach_dev().  This function is responsible for
detaching an ATA device and offlining the associated SCSI device
atomically so that the detached device is not accessed after ATA
detach is complete.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index da9689b70826..3dc6188af0e8 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -2762,3 +2762,27 @@ void ata_scsi_scan_host(struct ata_port *ap)
                 }
         }
 }
+
+/**
+ *      ata_scsi_offline_dev - offline attached SCSI device
+ *      @dev: ATA device to offline attached SCSI device for
+ *
+ *      This function is called from ata_eh_hotplug() and responsible
+ *      for taking the SCSI device attached to @dev offline.  This
+ *      function is called with host_set lock which protects dev->sdev
+ *      against clearing.
+ *
+ *      LOCKING:
+ *      spin_lock_irqsave(host_set lock)
+ *
+ *      RETURNS:
+ *      1 if attached SCSI device exists, 0 otherwise.
+ */
+int ata_scsi_offline_dev(struct ata_device *dev)
+{
+        if (dev->sdev) {
+                scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
+                return 1;
+        }
+        return 0;
+}