linux-kernel - Re: [PATCH 2/3] ti-st: st_kim: fix nshutdown_gpio in get_platform

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: <1435160348.12060.7.camel@bitron.ch>
Date:	Wed, 24 Jun 2015 17:39:08 +0200
From:	Jürg Billeter <j@...ron.ch>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gigi Joseph <gigi.joseph@...il.com>,
	Colin Ian King <colin.king@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ti-st: st_kim: fix nshutdown_gpio in
 get_platform_data

On Wed, 2015-06-24 at 11:31 -0400, Peter Hurley wrote:
> On 06/24/2015 06:24 AM, Jürg Billeter wrote:
> > @@ -761,8 +762,14 @@ static struct ti_st_plat_data
> > *get_platform_data(struct device *dev)
> >  	dt_property = of_get_property(np, "dev_name", &len);
> >  	if (dt_property)
> >  		memcpy(&dt_pdata->dev_name, dt_property, len);
> > -	of_property_read_u32(np, "nshutdown_gpio",
> > -			     &dt_pdata->nshutdown_gpio);
> > +
> > +	gpio = of_get_named_gpio(np, "nshutdown_gpio", 0);
> 
> NAK. This breaks existing dtbs, since the format is not the same.

Isn't the existing code completely broken as there is no predictable
GPIO numbering in general? There is also no documentation or use of
that device tree property in the kernel tree, as far as I can tell.

Do you have a suggestion how to fix this without breaking existing
dtbs? Do we need to introduce a second property and support both in the
driver?

Regards,
Jürg
--
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/