Re: [PATCH] VFIO/VMBUS: Add VFIO VMBUS driver support

[Stephen Hemminger]

On Mon, 11 Nov 2019 01:49:20 -0800
"Greg KH" <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:

> > +	ret = sysfs_create_bin_file(&channel->kobj,  
> &ring_buffer_bin_attr);
> > +	if (ret)
> > +		dev_notice(&dev->device,
> > +			   "sysfs create ring bin file failed; %d\n",  
> ret);
> > +  
> 
> Again, don't create sysfs files on your own, the bus code should be
> doing this for you automatically and in a way that is race-free.
> 
> thanks,
> 
> greg k-h

The sysfs file is only created if the VFIO/UIO driveris used.