linux-kernel - Re: [PATCH v2 6/9] usb: roles: Find the muxes by also matching against the device node

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Message-ID: <20190211104629.GE16987@kuha.fi.intel.com>
Date:   Mon, 11 Feb 2019 12:46:29 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Jun Li <jun.li@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Chen Yu <chenyu56@...wei.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] usb: roles: Find the muxes by also matching
 against the device node

On Mon, Feb 11, 2019 at 09:58:04AM +0000, Jun Li wrote:
> Hi Heikki,
> 
> > @@ -84,7 +85,12 @@ enum usb_role usb_role_switch_get_role(struct
> > usb_role_switch *sw)  }  EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
> > 
> > -static int __switch_match(struct device *dev, const void *name)
> > +static int switch_fwnode_match(struct device *dev, const void *fwnode)
> > +{
> > +	return dev_fwnode(dev) == fwnode;
> 
> You missed the comment
> https://lkml.org/lkml/2019/1/22/437
> 
> return dev_fwnode(dev->parent) == fwnode;

That's actually not the case. struct usb_role_switch_desc has a member
for fwnode, and that's what we use with the actual mux device. Check
usb_role_switch_register():

        ...
        sw->dev.fwnode = desc->fwnode;
        ...

Sorry for not realizing it before.


thanks,

-- 
heikki