linux-kernel - Re: [char-misc-next 2/3] mei: adding sysfs fw

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Date:	Wed, 24 Jul 2013 09:26:05 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>
Cc:	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ovsyanikov, Natalia" <natalia.ovsyanikov@...el.com>
Subject: Re: [char-misc-next 2/3] mei: adding sysfs fw_status attribute

On Wed, Jul 24, 2013 at 04:20:32PM +0000, Winkler, Tomas wrote:
> 
> 
> > >  int mei_register(struct mei_device *dev)  {
> > > +	struct device *device = &dev->pdev->dev;
> > >  	int ret;
> > > -	mei_misc_device.parent = &dev->pdev->dev;
> > > +
> > > +	mei_misc_device.parent = device;
> > >  	ret = misc_register(&mei_misc_device);
> > >  	if (ret)
> > >  		return ret;
> > >
> > > +	ret = sysfs_create_group(&device->kobj, &mei_attr_group);
> > > +	if (ret)
> > > +		return ret;
> > 
> 
> > And you just lost the race with userspace (you told it you had a device, it
> > went and scanned your attributes and saved them, then you registered
> > more...)
> > 
> > Please use the dev_groups field for your class to properly have the driver
> > core register these before userspace is told about the device, that's the
> > correct way to do this.
> 
> Just to make sure, is this what you're suggesting ?
> 
> device->groups = mei_attr_groups
> mei_misc_device.parent = device;
> ret = misc_register(&mei_misc_device);

Yes, that should work.  If not, please let me know, the code underwent
some changes in 3.11-rc2.

thanks,

greg k-h
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