linux-kernel - Re: [v3 PATCH] usb: create usb_debug

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Message-ID: <87k1ebj8vt.fsf@linux.intel.com>
Date:   Tue, 28 May 2019 11:11:50 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [v3 PATCH] usb: create usb_debug_root for gadget only


Hi,

Chunfeng Yun <chunfeng.yun@...iatek.com> writes:
> diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
> index 7fcb9f782931..88b3ee03a12d 100644
> --- a/drivers/usb/core/usb.c
> +++ b/drivers/usb/core/usb.c
> @@ -1190,7 +1190,7 @@ EXPORT_SYMBOL_GPL(usb_debug_root);
>  
>  static void usb_debugfs_init(void)
>  {
> -	usb_debug_root = debugfs_create_dir("usb", NULL);
> +	usb_debug_root = debugfs_create_dir(USB_DEBUG_ROOT_NAME, NULL);
>  	debugfs_create_file("devices", 0444, usb_debug_root, NULL,
>  			    &usbfs_devices_fops);
>  }

might be a better idea to move this to usb common. Then have a function
which can be called by both host and gadget to maybe create the
directory:

static struct dentry *usb_debug_root;

struct dentry *usb_debugfs_init(void)
{
	if (!usb_debug_root)
        	usb_debug_root = debugfs_create_dir("usb", NULL);

	return usb_debug_root;
}


Then usb core would be updated to something like:

static void usb_core_debugfs_init(void)
{
	struct dentry *root = usb_debugfs_init();

	debugfs_create_file("devices", 0444, root, NULL, &usbfs_devices_fops);
}

-- 
balbi