linux-kernel - Re: libata/PATA: GPCMD_SET_STREAMING via SG

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Message-ID: <20071114171139.GA9387@section-eight>
Date:	Wed, 14 Nov 2007 18:11:39 +0100
From:	Sebastian Kemper <sebastian_ml@....net>
To:	Mark Lord <lkml@....ca>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing

Hi Mark!

On Wed, Nov 14, 2007 at 11:41:37AM -0500, Mark Lord wrote:
> Ahh.. got it.  The host_status returned (not checked by that code) was 7,
> which means "host error".
>
> In this case, that's because the cmd_len is (16), which is too large for 
> ATAPI.
> It needs to be changed to (12) instead.

I don't understand. You seem to use a cmd_len of 16 in hdparm yourself.
And why does it work with the "old" ATA driver and not with libata if
16 is too large for ATAPI in general?

> The code (apart from totally mishandling any kinds of errors) works after 
> that.

Greetings
Sebastian
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