From 23fa9618094975f803ed0c6a44604b16747b9637 Mon Sep 17 00:00:00 2001
From: Tejun Heo <htejun@gmail.com>
Date: Mon, 12 Jun 2006 14:18:51 +0900
Subject: [PATCH] sata_sil: add controller unplug detection in sil_interrupt()

Short-circuit interrupt handling if BMDMA2 is reported as 0xffffffff
indicating device removal.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index 0898cbe..a7e99a1 100644
--- a/drivers/scsi/sata_sil.c
+++ b/drivers/scsi/sata_sil.c
@@ -419,7 +419,8 @@ static irqreturn_t sil_interrupt(int irq, void *dev_instance,
 		if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED))
 			continue;
 
-		if (!(bmdma2 & (SIL_DMA_COMPLETE | SIL_DMA_SATA_IRQ)))
+		if (bmdma2 == 0xffffffff ||
+		    !(bmdma2 & (SIL_DMA_COMPLETE | SIL_DMA_SATA_IRQ)))
 			continue;
 
 		sil_host_intr(ap, bmdma2);
-- 
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