[PATCH] sil24: add testing for PCI fault

03_sil24_add-pci-fault-check.patch

	On entry to interrupt handler, PORT_SLOT_STAT register is read
        first.  Check if PCI fault or device removal has occurred by
        testing the value for 0xffffffff.

Signed-off-by: Tejun Heo <htejun@gmail.com>

 sata_sil24.c |    6 ++++++
 1 files changed, 6 insertions(+)
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index 0f810cdd3cc2..c9318bda46a3 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -527,6 +527,12 @@ static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *
 
         status = readl(hpriv->host_base + HOST_IRQ_STAT);
 
+        if (status == 0xffffffff) {
+                printk(KERN_ERR DRV_NAME ": IRQ status == 0xffffffff, "
+                       "PCI fault or device removal?\n");
+                goto out;
+        }
+
         if (!(status & IRQ_STAT_4PORTS))
                 goto out;