[PATCH 1/1] regulator: gpio-regulator: fix crash when no states property in dt
Mark Brown
broonie at opensource.wolfsonmicro.com
Tue Nov 13 02:57:35 EST 2012
On Mon, Nov 12, 2012 at 09:56:47AM +0800, Frank Li wrote:
> 2012/11/10 Mark Brown <broonie at opensource.wolfsonmicro.com>:
> > On Fri, Nov 09, 2012 at 04:34:36PM +0800, Frank Li wrote:
> >> /* Fetch states. */
> >> prop = of_find_property(np, "states", NULL);
> >> - proplen = prop->length / sizeof(int);
> >> + proplen = prop ? prop->length / sizeof(int) : 0;
> > Aren't states mandatory for this driver, in which case shouldn't the
> > probe fail here?
> I think No. GPIO-Regulator can be used as just turn on/off power
> domain and not adjust voltage or current. So "states" is option.
> "gpios" was already options.
Are you sure this actually works? I glanced at the code and wasn't
convinced it was taking sufficient care to cope with this possibility.
Normally people use a fixed regulator for a regulator with a simple
on/off switch (which allows the voltage to be specified which this
won't...) so I'd be somewhat surprised if it were tested.
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