linux-kernel - Re: commit e38c0a1f breaks powerpc boards with uli1575 chip

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Date:	Thu, 19 Dec 2013 08:42:00 +0400
From:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
To:	Rob Herring <robherring2@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Alexey Lugovskoy <lugovskoy@....rtsoft.ru>,
	Dmitry Krivoschekov <dkrivoschokov@....rtsoft.ru>
Subject: Re: commit e38c0a1f breaks powerpc boards with uli1575 chip

> Reverting would break Tegra PCIe, but you should not have to change the
> DT either. So we need a solution.
>
> Is this something like this sufficient to fix it?
>
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index 4b9317b..378aebd 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -74,7 +74,7 @@ static u64 of_bus_default_map(__be32 *addr, const
> __be32 *range,
>          * mapping doesn't specify a physical address. Rather, the
> address * specifies an identifier that must match exactly.
>          */
> -       if (na > 2 && memcmp(range, addr, na * 4) != 0)
> +       if (na > 2 && memcmp(range, addr, (na - 2) * 4) != 0)
>                 return OF_BAD_ADDR;
>
>         if (da < cp || da >= (cp + s))


No, this does not help.

I've dumped the actual content of 'range' and 'addr' at the failure point 
(i.e. ar point that returns error with e38c0a1f but passes without 
e38c0a1f ):

OF: default map, cp=0, s=10000, da=70
range:  01 00 00 00 00 00 00 00 00 00 00 00
 addr:  00 00 00 00 00 00 00 00 00 00 00 70

Nikita
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