linux-kernel - Re: [PATCH v4] usb: create usb_debug

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Date:   Tue, 04 Jun 2019 10:47:55 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4] usb: create usb_debug_root for gadget only


Hi,

Greg Kroah-Hartman <gregkh@...uxfoundation.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