Re: [PATCH] ata, Add " 2GB ATA Flash Disk"/"ADMA428M" to DMA blacklist

[Jeff Garzik <jgarzik@pobox.com>]

On 05/08/2012 09:08 AM, Prarit Bhargava wrote:
> A user has several systems with a couple of models of flash disks with IDE
> connectors.  These disks work fine in 2.6.18-ish kernels but corrupt data on
> new kernels.
>
> The difference appears to be with the default I/O method used by the IDE
> controller driver between the kernels.  In the older kernels, the
> configuration is very conservative and the driver stays in PIO mode.  With
> new kernels, the ata driver (pata_serverworks) attempts to use UDMA/66
> which the drive claims to support.  This mode, however, does not appear to
> work in DMA mode.  The drive does work correctly and no corruption is
> seen if the kernel parameter "libata.force=5:pio0,6:pio0" is used to force
> the driver to use PIO instead of DMA mode.
>
> Blacklist these drives.  Unfortunately the model name of the drive is very
> generic, " 2GB ATA Flash Disk", but the revision is specific, "ADMA428M".
>
> Signed-off-by: Prarit Bhargava<prarit@redhat.com>
> Cc: Jeff Garzik<jgarzik@pobox.com>
> ---
>   drivers/ata/libata-core.c |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)

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