lkml.org 
[lkml]   [2009]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 12/94] tx4939ide: Do not use zero count PRD entry
2.6.28-stable review patch.  If anyone has any objections, please let us know.

------------------

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;


\
 
 \ /
  Last update: 2009-01-15 21:09    [W:0.250 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site