[src/trunk]: src/sys/arch/evbsh3/evbsh3 Sync with sys/arch/landisk/landisk/bu...

[nonaka <nonaka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3dd232c5da15
branches:  trunk
changeset: 335718:3dd232c5da15
user:      nonaka <nonaka%NetBSD.org@localhost>
date:      Thu Jan 22 03:43:24 2015 +0000

description:
Sync with sys/arch/landisk/landisk/bus_dma.c rev.1.15.

> Don't call sh_dcache_inv_range() on BUS_DMASYNC_POSTREAD ops
> as other mips and arm ports.
>
> All cached data is cared on BUS_DMASYNC_PREREAD and
> invalidating cache without writeback could cause unexpected
> data loss if specified sync region is not cacheline aligned.
>
> This may fix "ffs_alloccg: map corrupted" panic on acardide IDE disks,
> which didn't happen on USB HDD.

diffstat:

 sys/arch/evbsh3/evbsh3/bus_dma.c |  9 ++-------
 1 files changed, 2 insertions(+), 7 deletions(-)

diffs (30 lines):

diff -r 16c380cf2a79 -r 3dd232c5da15 sys/arch/evbsh3/evbsh3/bus_dma.c
--- a/sys/arch/evbsh3/evbsh3/bus_dma.c  Thu Jan 22 03:10:49 2015 +0000
+++ b/sys/arch/evbsh3/evbsh3/bus_dma.c  Thu Jan 22 03:43:24 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bus_dma.c,v 1.3 2011/07/19 15:44:52 dyoung Exp $       */
+/*     $NetBSD: bus_dma.c,v 1.4 2015/01/22 03:43:24 nonaka Exp $       */
 
 /*
  * Copyright (c) 2005 NONAKA Kimihiro <nonaka%netbsd.org@localhost>
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.3 2011/07/19 15:44:52 dyoung Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.4 2015/01/22 03:43:24 nonaka Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -545,11 +545,6 @@
                        if (SH_HAS_WRITEBACK_CACHE)
                                sh_dcache_wb_range(naddr, minlen);
                        break;
-
-               case BUS_DMASYNC_POSTREAD:
-               case BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE:
-                       sh_dcache_inv_range(naddr, minlen);
-                       break;
                }
                offset = 0;
                len -= minlen;