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Date: Wed, 24 Aug 2016 05:22:25 -0400
From: Greg KH <gregkh@linuxfoundation.org>
To: =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>,
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        =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
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Subject: Re: [PATCH V3] leds: trigger: Introduce an USB port trigger
Message-ID: <20160824092225.GB23180@kroah.com>
References: <20160823220404.9887-1-zajec5@gmail.com>
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On Wed, Aug 24, 2016 at 12:03:29AM +0200, Rafał Miłecki wrote:
> +static ssize_t ports_show(struct device *dev, struct device_attribute *attr,
> +			  char *buf)
> +{
> +	struct led_classdev *led_cdev = dev_get_drvdata(dev);
> +	struct usbport_trig_data *usbport_data = led_cdev->trigger_data;
> +	struct usbport_trig_port *port;
> +	ssize_t ret = 0;
> +	int len;
> +
> +	list_for_each_entry(port, &usbport_data->ports, list) {
> +		len = sprintf(buf + ret, "%s\n", port->name);
> +		if (len >= 0)
> +			ret += len;
> +	}
> +
> +	return ret;
> +}

sysfs is "one value per file", here you are listing a bunch of things in
one sysfs file.  Please don't do that.

greg k-h