linux-kernel - Re: [PATCH] cardbus: Add a fixup hook and fix powerpc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091216140128.16afbeb7@jbarnes-piketon>
Date:	Wed, 16 Dec 2009 14:01:28 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-pci@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	blofeldus@...oo.com, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] cardbus: Add a fixup hook and fix powerpc

On Wed, 09 Dec 2009 17:52:13 +1100
Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> The cardbus code creates PCI devices without ever going through the
> necessary fixup bits and pieces that normal PCI devices go through.
> 
> There's in fact a commented out call to pcibios_fixup_bus() in there,
> it's commented because ... it doesn't work.
> 
> I could make pcibios_fixup_bus() do the right thing on powerpc easily
> but I felt it cleaner instead to provide a specific hook
> pci_fixup_cardbus for which a weak empty implementation is provided
> by the PCI core.
> 
> This fixes cardbus on powerbooks and probably all other PowerPC
> platforms which was broken completely for ever on some platforms and
> since 2.6.31 on others such as PowerBooks when we made the DMA ops
> mandatory (since those are setup by the fixups).
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
> 
> Note: In the long run we might want to streamline the hooks for fixing
> up new devices vs. new busses and make some stuff common between
> cardbus and PCI hotplug which is actually a mess.
> 
> This is a quick fix that makes it work again in the meantime, and that
> I would like to see in 2.6.31 and 2.6.32 stable at least. 
> 
> Another option if you prefer is I can make my pcibios_fixup_bus() do
> the right thing in all cases I believe (by testing bus->is_added to
> skip stuff that must not be done twice) and we can remove the comment
> and stick the call in #ifdef CONFIG_PPC but I felt that solution was
> a tad cleaner.
> 
> Olof, once that's in you should be able to remove the hack you have in
> the PA-Semi code to work around this.
> 

Oops, looks like this fails for the modular case?  I get an unresolved
symbol error when building this with my default config...

Care to resend with the fix against my for-linus branch?

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/