[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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index 0898cbe6458c..a7e99a1def2f 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);