From cf2b5d3fcab77a9390293920ec5b49e67eced200 Mon Sep 17 00:00:00 2001
From: Doug Ledford <dledford@redhat.com>
Date: Sun, 17 Sep 2006 07:38:15 +0200
Subject: [PATCH] [SCSI] aic7xxx: pause sequencer before touching SBLKCTL
Some cards need to pause the sequencer before the SBLKCTL register is
touched. This fixes a PCI related oops seen on powerpc macs with this
card caused by trying to ascertain the bus signalling before beginning
domain validation.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
---
drivers/scsi/aic7xxx/aic7xxx_osm.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index 0b3c01ac42596..64c8b88a429fa 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2539,6 +2539,7 @@ static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
static void ahc_linux_get_signalling(struct Scsi_Host *shost)
{
struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
+ unsigned long flags;
u8 mode;
if (!(ahc->features & AHC_ULTRA2)) {
@@ -2550,7 +2551,11 @@ static void ahc_linux_get_signalling(struct Scsi_Host *shost)
return;
}
+ ahc_lock(ahc, &flags);
+ ahc_pause(ahc);
mode = ahc_inb(ahc, SBLKCTL);
+ ahc_unpause(ahc);
+ ahc_unlock(ahc, &flags);
if (mode & ENAB40)
spi_signalling(shost) = SPI_SIGNAL_LVD;
--
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