linux-kernel - Re: sym53c8xx PCI card broken in 2.6.18

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Message-ID: <ec7cefb0608222235p155b7ab0ld8a23d2db1fbe56d@mail.gmail.com>
Date:	Tue, 22 Aug 2006 22:35:14 -0700
From:	"Eric Brower" <ebrower@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: sym53c8xx PCI card broken in 2.6.18

On 8/22/06, David Miller <davem@...emloft.net> wrote:
> From: "Eric Brower" <ebrower@...il.com>
> Date: Tue, 22 Aug 2006 20:59:14 -0700
>
> > The envctrl OOPS is definately my fault in the blind conversion of the
> > driver to the OF interface-- of_find_propery() return values should be
> > checked for NULL rather than relying upon a -1 value stored into lenp.
> >  We can discuss this separately, since you are using an out-of-kernel
> > driver.
>
> Ok.
>
> BTW, it is better to use "of_get_property()" if you are actually
> interested in the value since it will return a void pointer to the
> property value instead of a "struct property".  of_find_property() is
> useful if you just want to check for existence or if you want to
> modify the property value.
>

Thanks, Dave.  This driver is interested in property existence and
length-- some OBP versions don't create all expected envctrl
properties, and due to lack of implementation documentation the
property lengths are being checked as well; so of_find_property()
seems appropriate in this case.

Would you consider assigning -1 to lenp (if provided) in
of_find_property() when no matching device is found?

Thanks,
E

-- 
E
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