linux-kernel - Re: [PATCH] pata

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Message-ID: <20070209201807.57e727a4@localhost.localdomain>
Date:	Fri, 9 Feb 2007 20:18:07 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, jeff@...zik.org
Subject: Re: [PATCH] pata_acpi: take two

> > +#if defined(CONFIG_ATA_ACPI)
> > +	/* Prefer the ACPI driver for Nvidia hardware */
> > +	if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && ata_pata_acpi_present(pdev))
> > +		return -ENODEV;
> > +#endif		
> >  	/* Check for AMD7411 */
> >  	if (type == 3)
> >  		/* FIFO is broken */
> 
> Problem with this approach is it may break distro/initrd setups since 
> the pata_amd driver appears to be the one that "should" work based on 
> the PCI ID, so the initrd would end up containing only this driver, 

Diddums

> which will fail out with -ENODEV and cause a boot failure. If the root 
> filesystem was on a disk driven by this controller, the mkinitrd stuff 
> would have to "know" that it should also try loading pata_acpi.

Indeed they will.

> Unless there are some Nvidia boxes out there which don't provide 
> _GTM/_STM ACPI methods (which seems a bit unlikely given Allen Martin's 
> comments) then we could potentially move the Nvidia PATA PCI IDs into 
> the pata_acpi driver, at least if ACPI is enabled in the kernel build..

No we can't. It is a dynamic evaluation. The user may be booting with
acpi=off to work around BIOS problems, so the distribution initrd tools
will just have to learn this out as they do the sata_nv funnies. (Nvidia
is already a special case)
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