linux-kernel - Re: libata & no PCI: dma_[un]map

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Date:	Mon, 4 Jun 2007 08:47:19 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	mroos@...ux.ee, linux-kernel@...r.kernel.org
Subject: Re: libata & no PCI: dma_[un]map_single undefined

On Sun, Jun 03, 2007 at 05:40:10PM -0700, David Miller wrote:
> From: Meelis Roos <mroos@...ux.ee>
> Date: Sun, 3 Jun 2007 23:23:33 +0300 (EEST)
> 
> > I accidentally enabled libata config options on my Sun Ultra 1 (sparc64, 
> > UP, no PCI, only SBUS):
> > 
> >   MODPOST 440 modules
> > ERROR: "dma_unmap_sg" [drivers/ata/libata.ko] undefined!
> > ERROR: "dma_map_sg" [drivers/ata/libata.ko] undefined!
> > ERROR: "dma_unmap_single" [drivers/ata/libata.ko] undefined!
> > ERROR: "dma_mapping_error" [drivers/ata/libata.ko] undefined!
> > ERROR: "dma_map_single" [drivers/ata/libata.ko] undefined!
> > 
> > CONFIG_PCI=n
> > CONFIG_ATA=m
> > 
> > This seems to be a valid configuration since libata can drive non-PCI 
> > devices too?
> 
> It really makes no sense to allow this on Sparc, there are no
> non-PCI Sparc ATA controllers.
> 
> Therefore I'll fix it like this:

The right fix is the depend on the new HAS_DMA (or whatever it's called)
symbol.  The proper long-term fix is to move calln to the dam mapping
functions from the core libata files into the drivers responsibility with
a default implementation for the typical cases.

> 
> commit 6274b5c63131c3110405db5d19e71af26cbbd375
> Author: David S. Miller <davem@...set.davemloft.net>
> Date:   Sun Jun 3 17:39:56 2007 -0700
> 
>     [ATA]: Don't allow to enable this for SPARC64 without PCI.
>     
>     Based upon a report from Meelis Roos.
>     
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index b4a8d60..7d893a6 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -8,6 +8,7 @@ menuconfig ATA
>  	depends on BLOCK
>  	depends on !(M32R || M68K) || BROKEN
>  	depends on !SUN4 || BROKEN
> +	depends on !(SPARC64 && !PCI)
>  	select SCSI
>  	---help---
>  	  If you want to use a ATA hard disk, ATA tape drive, ATA CD-ROM or
> -
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