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authorDenis Vlasenko <vda.linux@googlemail.com>2006-09-25 16:57:42 -0700
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-10-01 15:03:38 -0500
commit7b75b990e3cb33fd529640d589e77950e72a607c (patch)
tree1e282b2af06644587687f02d86419f604d87a907 /drivers/scsi/aic7xxx
parent02a0fa676cd453ce4254c2eee838307ffc5c37f4 (diff)
[SCSI] aic7xxx: fix byte I/O order in ahd_inw
Comment says "Read high byte first as some registers increment..." but code doesn't guarantee that, I think: return ((ahd_inb(ahd, port+1) << 8) | ahd_inb(ahd, port)); Compiler can reorder it. Make the order explicit. Signed-off-by: Denis Vlasenko <vda.linux@googlemail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Fixed rejections and added aic7xxx code Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/aic7xxx')
-rw-r--r--drivers/scsi/aic7xxx/aic79xx_inline.h3
-rw-r--r--drivers/scsi/aic7xxx/aic7xxx_inline.h3
2 files changed, 4 insertions, 2 deletions
diff --git a/drivers/scsi/aic7xxx/aic79xx_inline.h b/drivers/scsi/aic7xxx/aic79xx_inline.h
index 8ad3ce945b9e..a3266e066c00 100644
--- a/drivers/scsi/aic7xxx/aic79xx_inline.h
+++ b/drivers/scsi/aic7xxx/aic79xx_inline.h
@@ -527,7 +527,8 @@ ahd_inw(struct ahd_softc *ahd, u_int port)
* or have other side effects when the low byte is
* read.
*/
- return ((ahd_inb(ahd, port+1) << 8) | ahd_inb(ahd, port));
+ uint16_t r = ahd_inb(ahd, port+1) << 8;
+ return r | ahd_inb(ahd, port);
}
static __inline void
diff --git a/drivers/scsi/aic7xxx/aic7xxx_inline.h b/drivers/scsi/aic7xxx/aic7xxx_inline.h
index 2cc8a17ed8b4..8e1954cdd84f 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_inline.h
+++ b/drivers/scsi/aic7xxx/aic7xxx_inline.h
@@ -300,7 +300,8 @@ ahc_fetch_transinfo(struct ahc_softc *ahc, char channel, u_int our_id,
static __inline uint16_t
ahc_inw(struct ahc_softc *ahc, u_int port)
{
- return ((ahc_inb(ahc, port+1) << 8) | ahc_inb(ahc, port));
+ uint16_t r = ahc_inb(ahc, port+1) << 8;
+ return r | ahc_inb(ahc, port);
}
static __inline void