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

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Message-ID: <1558689951.10179.422.camel@mhfsdcap03>
Date:   Fri, 24 May 2019 17:25:51 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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, 2019-05-24 at 09:45 +0200, Greg Kroah-Hartman wrote:
> 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?
Sorry, I should send it out as v2 due to acked-by is added.

> 
> > 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?  
it seems usb_debug_root is only for host, but not for gadget only, it's
defined and created in usb/core/usb.c

> And shoudn't we
> create the usb root directory if only gadget is enabled?
Yes, need modify udc/core.c, it's better if support it, do you want me
to send a patch for it?

Thanks

> 
> thanks,
> 
> greg k-h