[PATCH v4] usb: create usb_debug_root for gadget only

Felipe Balbi felipe.balbi at linux.intel.com
Tue Jun 4 00:47:55 PDT 2019


Hi,

Greg Kroah-Hartman <gregkh at linuxfoundation.org> writes:
>> +struct dentry *usb_debugfs_init(void)
>> +{
>> +	if (!usb_debug_root)
>> +		usb_debug_root = debugfs_create_dir("usb", NULL);
>> +
>> +	atomic_inc(&usb_debug_root_refcnt);
>> +
>> +	return usb_debug_root;
>> +}
>> +EXPORT_SYMBOL_GPL(usb_debugfs_init);
>> +
>> +void usb_debugfs_cleanup(void)
>> +{
>> +	if (atomic_dec_and_test(&usb_debug_root_refcnt)) {
>> +		debugfs_remove_recursive(usb_debug_root);
>> +		usb_debug_root = NULL;
>> +	}
>> +}
>> +EXPORT_SYMBOL_GPL(usb_debugfs_cleanup);
>
> Only remove the debugfs subdir if the usbcore module is removed.  Create
> the debugfs subdir when the usbcore module is loaded.  No need for any
> reference counting of any sort at all.  No need to overthink this :)

There is a slight need to overthink. He wants to use the same directory
for gadget-only builds too :-)

-- 
balbi



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