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Commit cf2b5d3f authored by Doug Ledford's avatar Doug Ledford Committed by James Bottomley
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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: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 3e3c60e3

drivers/scsi/aic7xxx/aic7xxx_osm.c

+5 −0
Original line number Diff line number Diff line
@@ -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;