Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932155Ab0AETw4 (ORCPT ); Tue, 5 Jan 2010 14:52:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755301Ab0AETwz (ORCPT ); Tue, 5 Jan 2010 14:52:55 -0500 Received: from kroah.org ([198.145.64.141]:46014 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754736Ab0AETwx (ORCPT ); Tue, 5 Jan 2010 14:52:53 -0500 X-Mailbox-Line: From gregkh@mini.kroah.org Tue Jan 5 11:49:14 2010 Message-Id: <20100105194914.456262307@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Tue, 05 Jan 2010 11:47:53 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org, akpm@linux-foundation.org, torvalds@linux-foundation.org, stable-review@kernel.org Cc: Bartlomiej Zolnierkiewicz , Jeff Garzik Subject: [02/10] pata_cmd64x: fix overclocking of UDMA0-2 modes In-Reply-To: <20100105195007.GA23952@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1659 Lines: 43 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Bartlomiej Zolnierkiewicz 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 Signed-off-by: Jeff Garzik Signed-off-by: Greg Kroah-Hartman --- drivers/ata/pata_cmd64x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/ata/pata_cmd64x.c +++ b/drivers/ata/pata_cmd64x.c @@ -219,7 +219,7 @@ static void cmd64x_set_dmamode(struct at 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/