Re: [PATCH] leds: trigger/tty: feature data direction

[Uwe Kleine-König]

Hello Greg,

On Thu, Apr 22, 2021 at 10:05:28AM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 22, 2021 at 09:47:02AM +0200, Juergen Borleis wrote:
> > +static ssize_t dirfilter_show(struct device *dev,
> > +			      struct device_attribute *attr, char *buf)
> > +{
> > +	struct ledtrig_tty_data *trigger_data = led_trigger_get_drvdata(dev);
> > +
> > +	if (trigger_data->indirection)
> > +		return (ssize_t)sprintf(buf, "in\n");
> > +	if (trigger_data->outdirection)
> > +		return (ssize_t)sprintf(buf, "out\n");
> > +	return (ssize_t)sprintf(buf, "inout\n");
> 
> sysfs_emit() please.
> 
> And you are adding new sysfs files, that requires an update to
> Documentation/ABI/ please do so.

I agree to these two suggestions.

> But why are you adding random new sysfs values to a class device?  That
> feels really wrong.

This is quite usual for triggers and there is IMHO no way around this.
And it is also save as led_trigger_set() emits an uevent after a trigger
was activated.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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