[PATCH 2/2] libata: kill SCSI devices before detaching ata_host

[Tejun Heo <htejun@gmail.com>]

Kill SCSI devices before detaching port.  This makes drives properly
shut down on driver unload.

Signed-off-by: Tejun Heo <htejun@gmail.com>
---
 drivers/ata/libata-core.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: work1/drivers/ata/libata-core.c
===================================================================
--- work1.orig/drivers/ata/libata-core.c
+++ work1/drivers/ata/libata-core.c
@@ -7236,6 +7236,14 @@ static void ata_port_detach(struct ata_p
 	if (!ap->ops->error_handler)
 		goto skip_eh;
 
+	/* First, tell all SCSI devices that we're going down.  Note
+	 * that there's a small race window here.  Devices which get
+	 * hotplugged after forget_host but before EH is killed won't
+	 * get shut down by SCSI layer properly and will miss cache
+	 * flush and spin down.
+	 */
+	scsi_forget_host(ap->scsi_host);
+
 	/* tell EH we're leaving & flush EH */
 	spin_lock_irqsave(ap->lock, flags);
 	ap->pflags |= ATA_PFLAG_UNLOADING;