| From a0fce792b55b260589c3d77293a224e84395ec07 Mon Sep 17 00:00:00 2001 |
| From: Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
| Date: Mon, 29 Dec 2008 20:27:28 +0100 |
| Subject: tx4939ide: Do not use zero count PRD entry |
| |
| From: Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
| |
| commit a0fce792b55b260589c3d77293a224e84395ec07 upstream. |
| |
| This fixes data corruption on some heavy load. |
| |
| Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
| Cc: sshtylyov@ru.mvista.com |
| Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| drivers/ide/tx4939ide.c | 6 ++++++ |
| 1 file changed, 6 insertions(+) |
| |
| --- a/drivers/ide/tx4939ide.c |
| +++ b/drivers/ide/tx4939ide.c |
| @@ -259,6 +259,12 @@ static int tx4939ide_build_dmatable(ide_ |
| bcount = 0x10000 - (cur_addr & 0xffff); |
| if (bcount > cur_len) |
| bcount = cur_len; |
| + /* |
| + * This workaround for zero count seems required. |
| + * (standard ide_build_dmatable do it too) |
| + */ |
| + if ((bcount & 0xffff) == 0x0000) |
| + bcount = 0x8000; |
| *table++ = bcount & 0xffff; |
| *table++ = cur_addr; |
| cur_addr += bcount; |
