[patch 12/94] tx4939ide: Do not use zero count PRD entry

[Greg KH]

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

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

From: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>

commit a0fce792b55b260589c3d77293a224e84395ec07 upstream.

This fixes data corruption on some heavy load.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
Cc: sshtylyov@xxxxxxxxxxxxx
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 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;

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