linux-kernel - Re: [PATCH 1/4] gpiolib: introduce descriptor-based GPIO interface

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Date:	Thu, 10 Jan 2013 09:36:47 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Alexandre Courbot <acourbot@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 1/4] gpiolib: introduce descriptor-based GPIO interface

On Wed, Jan 09, 2013 at 11:10:55AM +0000, Russell King - ARM Linux wrote:
[...]
>         err = gpio_request(en_vdd_1v05, "EN_VDD_1V05");
>         if (err) {
>                 pr_err("%s: gpio_request failed: %d\n", __func__, err);
>                 return err;
>         }
> 
>         gpio_direction_output(en_vdd_1v05, 1);
> 
>         regulator = regulator_get(NULL, "vdd_ldo0,vddio_pex_clk");
>         if (IS_ERR_OR_NULL(regulator)) {
>                 pr_err("%s: regulator_get failed: %d\n", __func__,
>                        (int)PTR_ERR(regulator));
>                 goto err_reg;
>         }
> ...
> err_reg:
>         gpio_free(en_vdd_1v05);
> 
>         return err;
> }
> 
> So 'err' here is never set.  when IS_ERR_OR_NULL evaluates true.
> Setting 'err' to PTR_ERR(regulator) is not correct because a NULL return
> sets 'err' to zero.

FWIW, this one is fixed in the Tegra PCIe series I posted yesterday.

Thierry

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