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[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>
This commit is contained in:
Doug Ledford 2006-09-17 07:38:15 +02:00 committed by James Bottomley
parent 3e3c60e3a8
commit cf2b5d3fca
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/aic7xxx/aic7xxx_osm.c
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@ -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;