tx493[89]ide: Fix length for __ide_flush_dcache_range

This fixes data corruption on PIO mode.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: stable <stable@kernel.org>
Cc: sshtylyov@ru.mvista.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index 30d0d256230f..97cd9e0f66f6 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -564,7 +564,7 @@ static void tx4939ide_input_data_swap(ide_drive_t *drive, struct request *rq,
 
         while (count--)
                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
-        __ide_flush_dcache_range((unsigned long)buf, count * 2);
+        __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 }
 
 static void tx4939ide_output_data_swap(ide_drive_t *drive, struct request *rq,
@@ -578,7 +578,7 @@ static void tx4939ide_output_data_swap(ide_drive_t *drive, struct request *rq,
                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
                 ptr++;
         }
-        __ide_flush_dcache_range((unsigned long)buf, count * 2);
+        __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 }
 
 static const struct ide_tp_ops tx4939ide_tp_ops = {