linux-kernel - Re: [PATCH] watchdog docs: Fix use of WDIOC

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Date:	Tue, 6 Apr 2010 10:51:38 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	James Hogan <james@...anarts.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Trevor Keith <tsrk@...k.net>,
	James Hogan <james.hogan@...tec.com>,
	Ladinu Chandrasinghe <ladinu.pub@...il.com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] watchdog docs: Fix use of WDIOC_SETOPTIONS ioctl.

Hi James,

Will be added to the watchdog fixes that I'm preparing.

Thanks,
Wim.

> In the watchdog-test program and watchdog-api.txt, pass the values to
> the WDIOC_SETOPTIONS ioctl as a pointer to an integer containing the
> values intead of directly in the third ioctl argument. The actual
> watchdog drivers in drivers/watchdog don't read the options directly
> from the argument but use get_user and copy_from_user.
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> ---
>  Documentation/watchdog/src/watchdog-test.c |    8 ++++++--
>  Documentation/watchdog/watchdog-api.txt    |    5 ++---
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/watchdog/src/watchdog-test.c
> b/Documentation/watchdog/src/watchdog-test.c
> index a750532..63fdc34 100644
> --- a/Documentation/watchdog/src/watchdog-test.c
> +++ b/Documentation/watchdog/src/watchdog-test.c
> @@ -31,6 +31,8 @@ static void keep_alive(void)
>   */
>  int main(int argc, char *argv[])
>  {
> +    int flags;
> +
>      fd = open("/dev/watchdog", O_WRONLY);
> 
>      if (fd == -1) {
> @@ -41,12 +43,14 @@ int main(int argc, char *argv[])
> 
>      if (argc > 1) {
>  	if (!strncasecmp(argv[1], "-d", 2)) {
> -	    ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD);
> +	    flags = WDIOS_DISABLECARD;
> +	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
>  	    fprintf(stderr, "Watchdog card disabled.\n");
>  	    fflush(stderr);
>  	    exit(0);
>  	} else if (!strncasecmp(argv[1], "-e", 2)) {
> -	    ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
> +	    flags = WDIOS_ENABLECARD;
> +	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
>  	    fprintf(stderr, "Watchdog card enabled.\n");
>  	    fflush(stderr);
>  	    exit(0);
> diff --git a/Documentation/watchdog/watchdog-api.txt
> b/Documentation/watchdog/watchdog-api.txt
> index 4cc4ba9..eb7132e 100644
> --- a/Documentation/watchdog/watchdog-api.txt
> +++ b/Documentation/watchdog/watchdog-api.txt
> @@ -222,11 +222,10 @@ returned value is the temperature in degrees fahrenheit.
>      ioctl(fd, WDIOC_GETTEMP, &temperature);
> 
>  Finally the SETOPTIONS ioctl can be used to control some aspects of
> -the cards operation; right now the pcwd driver is the only one
> -supporting this ioctl.
> +the cards operation.
> 
>      int options = 0;
> -    ioctl(fd, WDIOC_SETOPTIONS, options);
> +    ioctl(fd, WDIOC_SETOPTIONS, &options);
> 
>  The following options are available:
> 
> -- 
> 1.6.6.1
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