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| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-12-20 19:22:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-06 14:26:29 -0800 |
| commit | 7564ecada882a2ec698bddcfb85a48e4b0e2b2a5 (patch) | |
| tree | fbe865262c6e3201b4dec73df9ff9393db075121 /drivers | |
| parent | 73b52c3b88805ec5528c647fcb71eab3443e47cb (diff) | |
| download | lwn-7564ecada882a2ec698bddcfb85a48e4b0e2b2a5.tar.gz lwn-7564ecada882a2ec698bddcfb85a48e4b0e2b2a5.zip | |
pata_cmd64x: fix overclocking of UDMA0-2 modes
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@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | 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 f98dffedf4bc..f0bad9be0f65 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 */ |