[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, 28 insertions, 0 deletions

diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 8ecb8424d7ba..a049bffdf770 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -667,6 +667,34 @@ void ata_eh_qc_retry(struct ata_queued_cmd *qc)
 }
 
 /**
+ *      ata_eh_detach_dev - detach ATA device
+ *      @dev: ATA device to detach
+ *
+ *      Detach @dev.
+ *
+ *      LOCKING:
+ *      None.
+ */
+static void ata_eh_detach_dev(struct ata_device *dev)
+{
+        struct ata_port *ap = dev->ap;
+        unsigned long flags;
+
+        ata_dev_disable(dev);
+
+        spin_lock_irqsave(&ap->host_set->lock, flags);
+
+        dev->flags &= ~ATA_DFLAG_DETACH;
+
+        if (ata_scsi_offline_dev(dev)) {
+                dev->flags |= ATA_DFLAG_DETACHED;
+                ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
+        }
+
+        spin_unlock_irqrestore(&ap->host_set->lock, flags);
+}
+
+/**
  *      ata_eh_about_to_do - about to perform eh_action
  *      @ap: target ATA port
  *      @action: action about to be performed