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SubjectRe: [rfc-patch 01/01] leds-48xx: unnecessary extern decl is needed !?
Jim Cromie wrote:
>
> in the following patch, this extern decl is necessary.
>
> +//extern struct nsc_gpio_ops scx200_gpio_ops;
>
> Because its commented out, I get this error:
>
> CC [M] drivers/leds/leds-net48xx.o
> drivers/leds/leds-net48xx.c: In function ‘net48xx_error_led_set’:
> drivers/leds/leds-net48xx.c:31: error: ‘scx200_gpio_ops’ undeclared
> (first use in this function)
> drivers/leds/leds-net48xx.c:31: error: (Each undeclared identifier is
> reported only once
> drivers/leds/leds-net48xx.c:31: error: for each function it appears in.)
> make[2]: *** [drivers/leds/leds-net48xx.o] Error 1
> make[1]: *** [drivers/leds] Error 2
> make: *** [drivers] Error 2
>
>
> Shouldnt EXPORT_SYMBOL(scx200_gpio_ops) prevent exactly that ?
> On a SWAG, I removed 'static' from the 2 vtables, this made no
> difference (as I expected)
> With the // removed, it builds fine and works.
> What have I missed ?
> What search terms would have found previous cases ?

Well, it wouldn't work without EXPORT_SYMBOL either (probably should be
EXPORT_SYMBOL_GPL these days too) but you need to declare it one place or
another or the compiler doesn't know it exists at all! This should ideally be in
scx200_gpio.h but I was too lazy to add it! :-P

Just add that line to the header and all will be well. Looks good otherwise.

>
> Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
>
> ---
>
> $ diffstat diff.leds-nsc-gpio
> leds-net48xx.c | 10 +++++-----
> 1 files changed, 5 insertions(+), 5 deletions(-)
>
>
> diff -ruNp -X dontdiff -X exclude-diffs x-2/drivers/leds/leds-net48xx.c
> x-led/drivers/leds/leds-net48xx.c
> --- x-2/drivers/leds/leds-net48xx.c 2006-07-09 10:38:00.000000000 -0600
> +++ x-led/drivers/leds/leds-net48xx.c 2006-07-11 13:22:54.000000000
> -0600
> @@ -15,8 +15,11 @@
> #include <linux/platform_device.h>
> #include <linux/leds.h>
> #include <linux/err.h>
> -#include <asm/io.h>
> +#include <linux/io.h>
> #include <linux/scx200_gpio.h>
> +#include <linux/nsc_gpio.h>
> +
> +//extern struct nsc_gpio_ops scx200_gpio_ops;
>
> #define NET48XX_ERROR_LED_GPIO 20
>
> @@ -25,10 +28,7 @@ static struct platform_device *pdev;
> static void net48xx_error_led_set(struct led_classdev *led_cdev,
> enum led_brightness value)
> {
> - if (value)
> - scx200_gpio_set_high(NET48XX_ERROR_LED_GPIO);
> - else
> - scx200_gpio_set_low(NET48XX_ERROR_LED_GPIO);
> + scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value);
> }
>
> static struct led_classdev net48xx_error_led = {
>
>
>

Chris

--
Chris Boot
bootc@bootc.net
http://www.bootc.net/
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