Re: [PATCH] libata: skip reset on bus not a device

[Tejun Heo]

Joe Jin wrote:
> > > It's against libata development tree.  So, you downloaded the tar.gz 
> > and
> > > tested it?
>
> no, but at latest kernel 2.6.19-rc1 use the same tree as you said, and
> it also can worked

I see.  It's irrelevant anyway.

> > And, one more thing to try.  The following patch should fix your
> > problem.  It's against v2.6.18.
>
> while applied the patch, error info gone :)
>
> A question: if the status register return 0xFF means the device not exist?
> why not use ata_devchk()?

Many SATA controllers emulate TF registers and pass devchk even when no 
device is attached.  I don't know whether the two conditions can happen 
together - 0xFF status is usually seen on PATA.  Anyways, it's more 
reliable to test 0xFF.  Also, that's what driver/ide has been doing for 
a long long time and we don't want to deviate from it if possible.

--
tejun
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