Re: [PATCH v3 01/11] leds: led-class: Add missing put_device() to led_put()

[Andy Shevchenko <andy@xxxxxxxxxx>]

On Fri, Dec 16, 2022 at 03:35:29PM +0200, Andy Shevchenko wrote:
> On Fri, Dec 16, 2022 at 12:30:03PM +0100, Hans de Goede wrote:

...

> >  	led_cdev = dev_get_drvdata(led_dev);
> >  
> > -	if (!try_module_get(led_cdev->dev->parent->driver->owner))
> > +	if (!try_module_get(led_cdev->dev->parent->driver->owner)) {
> > +		put_device(led_cdev->dev);
> >  		return ERR_PTR(-ENODEV);
> > +	}
> >  
> >  	return led_cdev;
> 
> ...
> 
> >  void led_put(struct led_classdev *led_cdev)
> >  {
> >  	module_put(led_cdev->dev->parent->driver->owner);
> > +	put_device(led_cdev->dev);
> 
> Hmm... It was in the original submission.
> 
> https://lore.kernel.org/linux-leds/1443605522-1118-2-git-send-email-tomi.valkeinen@xxxxxx/

...

> Nevertheless, shouldn't you put device before putting module? (It may need to
> save the owner of the driver, I think.)

I think this is wrong, the symmetry is kept correct in your patch.

-- 
With Best Regards,
Andy Shevchenko