linux-kernel - [PATCH 10/97] pata_cmd64x: fix overclocking of UDMA0-2 modes

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Date:	Mon,  4 Jan 2010 16:32:23 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 10/97] pata_cmd64x: fix overclocking of UDMA0-2 modes

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

commit 509426bd46ad0903dca409803e0ee3d30f99f1e8 upstream.

adev->dma_mode stores the transfer mode value not UDMA mode number
so the condition in cmd64x_set_dmamode() is always true and the higher
UDMA clock is always selected.  This can potentially result in data
corruption when UDMA33 device is used, when 40-wire cable is used or
when the error recovery code decides to lower the device speed down.

The issue was introduced in the commit 6a40da0 ("libata cmd64x: whack
into a shape that looks like the documentation") which goes back to
kernel 2.6.20.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/ata/pata_cmd64x.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c
index f98dffe..f0bad9b 100644
--- a/drivers/ata/pata_cmd64x.c
+++ b/drivers/ata/pata_cmd64x.c
@@ -219,7 +219,7 @@ static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 		regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
 		/* Merge the control bits */
 		regU |= 1 << adev->devno; /* UDMA on */
-		if (adev->dma_mode > 2)	/* 15nS timing */
+		if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
 			regU |= 4 << adev->devno;
 	} else {
 		regU &= ~ (1 << adev->devno);	/* UDMA off */
-- 
1.6.6

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