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@xxxxxxxxx>
---
drivers/scsi/libata-eh.c | 28 ++++++++++++++++++++++++++++
drivers/scsi/libata-scsi.c | 24 ++++++++++++++++++++++++
drivers/scsi/libata.h | 1 +
3 files changed, 53 insertions(+), 0 deletions(-)
f42d6c9dfcfd3f3f720b2bee67ab83046ae9e855
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 4189bb4..695375b 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -629,6 +629,34 @@ void ata_eh_qc_retry(struct ata_queued_c
}
/**
+ * 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
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index a1caf3f..acfa26c 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
}
}
}
+
+/**
+ * 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;
+}
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index e3f7406..15628b8 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -75,6 +75,7 @@ extern int ata_cmd_ioctl(struct scsi_dev
extern struct scsi_transport_template ata_scsi_transport_template;
extern void ata_scsi_scan_host(struct ata_port *ap);
+extern int ata_scsi_offline_dev(struct ata_device *dev);
extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
unsigned int buflen);
--
1.3.2
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