Commit cf2b5d3f authored by Doug Ledford's avatar Doug Ledford Committed by James Bottomley

[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: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 3e3c60e3
...@@ -2539,6 +2539,7 @@ static void ahc_linux_set_iu(struct scsi_target *starget, int iu) ...@@ -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) static void ahc_linux_get_signalling(struct Scsi_Host *shost)
{ {
struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata; struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
unsigned long flags;
u8 mode; u8 mode;
if (!(ahc->features & AHC_ULTRA2)) { if (!(ahc->features & AHC_ULTRA2)) {
...@@ -2550,7 +2551,11 @@ static void ahc_linux_get_signalling(struct Scsi_Host *shost) ...@@ -2550,7 +2551,11 @@ static void ahc_linux_get_signalling(struct Scsi_Host *shost)
return; return;
} }
ahc_lock(ahc, &flags);
ahc_pause(ahc);
mode = ahc_inb(ahc, SBLKCTL); mode = ahc_inb(ahc, SBLKCTL);
ahc_unpause(ahc);
ahc_unlock(ahc, &flags);
if (mode & ENAB40) if (mode & ENAB40)
spi_signalling(shost) = SPI_SIGNAL_LVD; spi_signalling(shost) = SPI_SIGNAL_LVD;
......
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