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SubjectRe: [PATCH 2/2] enhance sysfs rfkill interface
On Fri, 12 Mar 2010 10:22:09 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> On Fri, Mar 12, 2010 at 07:03:08PM +0100, florian@mickler.org wrote:
> >
> > +static ssize_t rfkill_hard_show(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + struct rfkill *rfkill = to_rfkill(dev);
> > + unsigned long flags;
> > + u32 state;
> > +
> > + spin_lock_irqsave(&rfkill->lock, flags);
> > + state = rfkill->state;
> > + spin_unlock_irqrestore(&rfkill->lock, flags);
>
> Why exactly is this lock needed?

The rfkill state is updated from multiple contexts... Am I overlooking
smth obvious here?

cheers,
Flo


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