pata_sis: FIFO whack

If you are using a SiS controller and the BIOS didn't set it up then the
FIFO may be left active when we try and set up the CD. Not convinced this
matters but I'd prefer to be safe

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index 2b4508206a6c..657b1ee2f5c1 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -149,6 +149,9 @@ static int sis_pre_reset(struct ata_port *ap, unsigned long deadline)
         if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no]))
                 return -ENOENT;
 
+        /* Clear the FIFO settings. We can't enable the FIFO until
+           we know we are poking at a disk */
+        pci_write_config_byte(pdev, 0x4B, 0);
         return ata_std_prereset(ap, deadline);
 }