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Subject[PATCH 37/61] SCSI: aic7xxx: pause sequencer before touching SBLKCTL
-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Doug Ledford <dledford@redhat.com>

[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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

---
drivers/scsi/aic7xxx/aic7xxx_osm.c | 5 +++++
1 file changed, 5 insertions(+)

--- linux-2.6.18.1.orig/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ linux-2.6.18.1/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2539,6 +2539,7 @@ static void ahc_linux_set_iu(struct scsi
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(str
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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