[PATCH 37/61] SCSI: aic7xxx: pause sequencer before touching SBLKCTL

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Doug Ledford <dledford@xxxxxxxxxx>

[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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 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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