linux-kernel - Re: [PATCH] Input: LEDs

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Date:	Thu, 23 Jul 2015 13:57:13 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Jiri Kosina <jkosina@...e.com>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Pali Rohár <pali.rohar@...il.com>,
	linux-input@...r.kernel.org, rpurdie@...ys.net,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: LEDs - skip unnamed LEDs

On Thu, Jul 23, 2015 at 08:19:13AM +0200, Pavel Machek wrote:
> On Wed 2015-07-22 15:02:02, Dmitry Torokhov wrote:
> > Devices may declare more LEDs than what is known to input-leds
> > (HID does this for some devices). Instead of showing ugly warnings
> > on connect and, even worse, oopsing on disconnect, let's simply
> > ignore LEDs that are not known to us.
> > 
> > Reported-by: Vlastimil Babka <vbabka@...e.cz>
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > ---
> >  drivers/input/input-leds.c |   16 ++++++++++++++--
> >  1 file changed, 14 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
> > index 074a65e..766bf26 100644
> > --- a/drivers/input/input-leds.c
> > +++ b/drivers/input/input-leds.c
> > @@ -71,6 +71,18 @@ static void input_leds_event(struct input_handle *handle, unsigned int type,
> >  {
> >  }
> >  
> > +static int input_leds_get_count(struct input_dev *dev)
> > +{
> > +	unsigned int led_code;
> > +	int count = 0;
> > +
> > +	for_each_set_bit(led_code, dev->ledbit, LED_CNT)
> > +		if (input_led_info[led_code].name)
> > +			count++;
> > +
> > +	return count;
> > +}
> > +
> >  static int input_leds_connect(struct input_handler *handler,
> >  			      struct input_dev *dev,
> >  			      const struct input_device_id *id)
> > @@ -81,7 +93,7 @@ static int input_leds_connect(struct input_handler *handler,
> >  	int led_no;
> >  	int error;
> >  
> > -	num_leds = bitmap_weight(dev->ledbit, LED_CNT);
> > +	num_leds = input_leds_get_count(dev);
> >  	if (!num_leds)
> >  		return -ENXIO;
> >  
> > @@ -112,7 +124,7 @@ static int input_leds_connect(struct input_handler *handler,
> >  		led->handle = &leds->handle;
> >  		led->code = led_code;
> >  
> > -		if (WARN_ON(!input_led_info[led_code].name))
> > +		if (!input_led_info[led_code].name)
> >  			continue;
> >  
> >  		led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s",
> >
> 
> Are you sure? AFAICT you need to fix err_unregister_leds not to
> unregister leds with no name...

Well, if we skip unnamed leds and do not include them into total count
then we won't need to unregister them.

Thanks.

-- 
Dmitry
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