On Sun, Jan 26, 2014 at 4:21 AM, Geert Uytterhoeven
<geert@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
Just got fixed in mainline:
commit 00b2c76a6abbe082bb5afb89ee49ec325e9cd4d2
Author: David Howells <dhowells@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> ---
> include/linux/of.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 70c64ba17fa5..0bf44f2fe092 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -383,7 +383,7 @@ static inline void __of_use_dn(const struct device_node *np)
> }
>
> #define for_each_child_of_node(parent, child) \
> - while (__of_use_dn(parent), __of_use_dn(child), 0)
> + while (__of_use_dn(parent), child = NULL, 0)
>
> #define for_each_available_child_of_node(parent, child) \
> while (0)
> --
> 1.7.9.5
>
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