linux-kernel - Re: [RESEND PATCH] usb: mtu3: fix up undefined reference to usb_debug

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Date:   Fri, 24 May 2019 09:45:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] usb: mtu3: fix up undefined reference to
 usb_debug_root

On Fri, May 24, 2019 at 02:11:33PM +0800, Chunfeng Yun wrote:
> When CONFIG_USB is not set, and CONFIG_USB_GADGET is set,
> there is an issue:
> 
> ld:
> drivers/usb/mtu3/mtu3_debugfs.o: in function 'ssusb_debugfs_create_root':
> mtu3_debugfs.c:(.text+0xba3): undefined reference to 'usb_debug_root'
> 
> usb_debug_root is only built when CONFIG_USB is enabled, so here drop it
> and use NULL instead.
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Acked-by: Randy Dunlap <rdunlap@...radead.org>
> ---
>  drivers/usb/mtu3/mtu3_debugfs.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

Why resend?

> diff --git a/drivers/usb/mtu3/mtu3_debugfs.c b/drivers/usb/mtu3/mtu3_debugfs.c
> index 62c57ddc554e..b7c86ccd50b4 100644
> --- a/drivers/usb/mtu3/mtu3_debugfs.c
> +++ b/drivers/usb/mtu3/mtu3_debugfs.c
> @@ -528,8 +528,7 @@ void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb)
>  
>  void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb)
>  {
> -	ssusb->dbgfs_root =
> -		debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
> +	ssusb->dbgfs_root = debugfs_create_dir(dev_name(ssusb->dev), NULL);

This moves the directory to a new location no matter what the
configuration is. What's wrong with where it is today?  And shoudn't we
create the usb root directory if only gadget is enabled?

thanks,

greg k-h