linux-kernel - Re: [PATCH v2 2/2] USB: misc: Add onboard_usb

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Message-ID: <20200923222545.GB2105328@google.com>
Date:   Wed, 23 Sep 2020 15:25:45 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, Bastien Nocera <hadess@...ess.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Peter Chen <peter.chen@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH v2 2/2] USB: misc: Add onboard_usb_hub driver

On Mon, Sep 21, 2020 at 06:18:37PM -0700, Matthias Kaehlcke wrote:
> On Sun, Sep 20, 2020 at 04:17:20PM +0200, Greg Kroah-Hartman wrote:
> > On Thu, Sep 17, 2020 at 11:46:22AM -0700, Matthias Kaehlcke wrote:
> > >
> > > ...
> > >
> > > +static int __init onboard_hub_init(void)
> > > +{
> > > +	int rc;
> > > +
> > > +	rc = platform_driver_register(&onboard_hub_driver);
> > > +	if (rc)
> > > +		return rc;
> > > +
> > > +	return usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE);
> > 
> > No unwinding of the platform driver register if this fails?
> 
> Right, will add unwinding.
> 
> > And THIS_MODULE should not be needed, did we get the api wrong here?
> 
> It seems you suggest to use usb_register() instead, SGTM

Actually usb_register() is for registering a struct usb_driver, however
this is a struct usb_device_driver, there doesn't seem to be a
registration function/macro that doesn't require THIS_MODULE. Please
provide a pointer if I'm wrong.