linux-kernel - Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

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]

Date:	Thu, 8 Aug 2013 10:59:18 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Wei Ni <wni@...dia.com>, "khali@...ux-fr.org" <khali@...ux-fr.org>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

On Thu, Aug 08, 2013 at 11:33:13AM -0600, Stephen Warren wrote:
> On 08/08/2013 05:23 AM, Guenter Roeck wrote:
> > On 08/08/2013 02:47 AM, Wei Ni wrote:
> ...
> >> I think get_regulator() will return error values, not only
> >> -EPROBE_DEFER, so we should set data->lm90_reg to NULL to handle other
> >> error values.
> >>
> > Matter of opinion if you want to check for IS_ERR or NULL later on.
> 
> No, if regulator returns either:
> 
> * Something valid
> * Someting IS_ERR()
> 
> ... then everywhere has to check the value using IS_ERR().
> 
> If regulator returns either:
> 
> * Something valid
> * Someting NULL
> 
> ... then everywhere has to check the value against NULL.
> 
Other drivers calling get_regulator() don't check against NULL,
so it should not be needed here either.

Guenter

> checking against both IS_ERR() and NULL shouldn't ever happen, and
> likewise IS_ERR_OR_NULL() is deprecated.
> 
--
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/