[PATCH] tx4939ide: Do not use zero count PRD entry

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This fixes data corruption on some heavy load.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
---
 drivers/ide/tx4939ide.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index bafb7d1..30d0d25 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -259,6 +259,12 @@ static int tx4939ide_build_dmatable(ide_drive_t *drive, struct request *rq)
 			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;
-- 
1.5.6.3

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