Re: [PATCH] [1/12] x86: Work around mmio config space quirk on AMD Fam10h

[Linus Torvalds <torvalds@linux-foundation.org>]

On Thu, 9 Aug 2007, Andi Kleen wrote:
>
> Some broken devices have been discovered to require %al/%ax/%eax registers 
> for MMIO config space accesses.  Modify mmconfig.c to use these registers 
> explicitly (rather than modify the global readb/writeb/etc inlines).
> 
> AK: also changed i386 to always use eax
> AK: moved change to extended space probing to different patch
> AK: reworked with inlines according to Linus' requirements.
> AK: improve comments.
> 
> Signed-off-by: dean gaudet <dean@arctic.org>
> Signed-off-by: Andi Kleen <ak@suse.de>

Damn you, Andi.

You had obviously never actually tested this on x86.

> --- linux.orig/arch/i386/pci/mmconfig.c
> +++ linux/arch/i386/pci/mmconfig.c
> -		writeb(value, mmcfg_virt_addr + reg);
> +		mmio_config_writeb(mmcfg_virt_addr, value);

Notice something missing here? The new code cannot work on any machine 
that actually uses mmio cfg.

		Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/