linux-kernel - Re: [PATCH] of: Fix uninitialized child warning in for_each_child_of

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Date:	Mon, 27 Jan 2014 15:52:42 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: Fix uninitialized child warning in
 for_each_child_of_node() if !OF

On Mon, Jan 27, 2014 at 3:16 PM, Rob Herring <robherring2@...il.com> wrote:
> On Sun, Jan 26, 2014 at 4:21 AM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
>> If CONFIG_OF=n:
>>
>> drivers/i2c/i2c-mux.c: In function ‘i2c_add_mux_adapter’:
>> drivers/i2c/i2c-mux.c:158: warning: ‘child’ is used uninitialized in this function
>> drivers/leds/leds-lp55xx-common.c: In function ‘lp55xx_of_populate_pdata’:
>> drivers/leds/leds-lp55xx-common.c:560: warning: ‘child’ is used uninitialized in this function
>> drivers/leds/leds-pwm.c: In function ‘led_pwm_probe’:
>> drivers/leds/leds-pwm.c:89: warning: ‘child’ is used uninitialized in this function
>> drivers/mfd/stmpe.c: In function ‘stmpe_of_probe’:
>> drivers/mfd/stmpe.c:1112: warning: ‘child’ is used uninitialized in this function
>> drivers/mfd/tc3589x.c: In function ‘tc3589x_probe’:
>> drivers/mfd/tc3589x.c:324: warning: ‘child’ is used uninitialized in this function
>> drivers/power/charger-manager.c: In function ‘of_cm_parse_desc’:
>> drivers/power/charger-manager.c:1606: warning: ‘child’ is used uninitialized in this function
>>
>> Introduced by commit 00b2c76a6abbe082bb5afb89ee49ec325e9cd4d2
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> ("include/linux/of.h: make for_each_child_of_node() reference its args when
>> CONFIG_OF=n").
>>
>> Instead of dropping the "__of_use_dn(child)" again, explicitly set child
>> to NULL, to protect against code using child after the loop (child == NULL
>> is the loop termination condition if CONFIG_OF=y).
>>
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> Just got fixed in mainline:
>
> commit 00b2c76a6abbe082bb5afb89ee49ec325e9cd4d2

Nope, this is the one that introduced new warnings.

> Author: David Howells <dhowells@...hat.com>
> Date:   Thu Jan 23 15:54:02 2014 -0800
>
>     include/linux/of.h: make for_each_child_of_node() reference its
> args when CONFIG_OF=n
>
>     Make for_each_child_of_node() reference its args when CONFIG_OF=n to
>     avoid warnings like:
>
>         drivers/leds/leds-pwm.c:88:22: warning: unused variable 'node'
> [-Wunused-variable]
>           struct device_node *node = pdev->dev.of_node;
>                               ^
>
>     Signed-off-by: David Howells <dhowells@...hat.com>
>     Cc: Grant Likely <grant.likely@...aro.org>
>     Cc: Rob Herring <robh+dt@...nel.org>
>     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>




-- 
Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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