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DateWed, 09 May 2007 20:08:26 -0400
FromJeff Garzik <>
SubjectRe: [PATCH] libata: fallback to the other IDENTIFY on device error
Tejun Heo wrote:
> It seems the world isn't as frank as we thought and some devices lie
> about who they are. Fallback to the other IDENTIFY if IDENTIFY fails
> with device error. As this is the strategy used by IDE for a long
> time, it shouldn't cause too much problem.
>
> Signed-off-by: Tejun Heo <htejun@gmail.com>
> Cc: William Thompson <wt@electro-mechanical.com>
> ---
> Willam, please verify this fixes your problem. Jeff, after all, we
> seem to need this. :-(
>
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index ca67484..f543109 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -1652,7 +1652,7 @@ int ata_dev_read_id(struct ata_device *d
> struct ata_taskfile tf;
> unsigned int err_mask = 0;
> const char *reason;
> - int tried_spinup = 0;
> + int may_fallback = 1, tried_spinup = 0;
> int rc;
>
> if (ata_msg_ctl(ap))
> @@ -1696,11 +1696,30 @@ int ata_dev_read_id(struct ata_device *d
> return -ENOENT;
> }
>
> + if (may_fallback && (err_mask == AC_ERR_DEV)) {
> + may_fallback = 0;
> +
> + /* Device or controller might have reported
> + * the wrong device class. Give a shot at then
> + * other IDENTIFY
> + */
> + if (class == ATA_DEV_ATA)
> + class = ATA_DEV_ATAPI;
> + else
> + class = ATA_DEV_ATA;

The error handling should be more specific -- check and make sure the
error is 'command aborted'

Jeff



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