Sascha Hauer wrote:
> On Fri, Jun 22, 2012 at 11:54:02AM +0200, Juergen Beisert wrote:
> > This patch adds a simple wd command which can setup, trigger and stop a
> > watchdog on the platform.
> >
> > +static int do_wd(int argc, char *argv[])
> > +{
> > + int rc;
> > +
> > + if (argc > 1) {
> > + if (isdigit(*argv[1])) {
> > + timeout = simple_strtoul(argv[1], NULL, 0);
> > + } else {
> > + printf("numerical parameter expected\n");
> > + return 1;
> > + }
> > + }
> > +
> > + rc = watchdog_set_timeout(timeout);
> > + if (rc == -EINVAL) {
>
> Why do you check for -EINVAL only? This way all other errors will be
> silently ignored.
Are you sure we must handle other failure codes than -EINVAL here? The called
function is very simple and only must distinguish "timeout != 0" and "timeout
== 0". So, timeout can be "out of range" or - as you mentioned - some
platforms cannot disable the watchdog anymore once it is enabled. Both
results into -EINVAL, because the called function cannot use the given value.
What else can happen?
> > + if (timeout == 0)
> > + printf("Watchdog cannot be disabled\n");
> > + else
> > + printf("Timeout value out of range\n");
> > + return rc;
>
> Do not return negative error codes here. The shell will interpret
> negative numbers as 'exit'. You have to return 1 for failure.
Okay, missed that.
> > + }
> > + return 0;
> > +}
> > +
> > +
> > +#ifndef INCLUDE_WATCHDOG_H
> > +# define INCLUDE_WATCHDOG_H
> > +
> > +extern int watchdog_set_timeout(unsigned);
>
> extern is not needed here.
Okay.
jbe
--
Pengutronix e.K. | Juergen Beisert |
Linux Solutions for Science and Industry | http://www.pengutronix.de/ |
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