linux-kernel - Re: [PATCH 02/14] soundwire: Add SoundWire bus type

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Message-ID: <20171020160134.GT30097@localhost>
Date:   Fri, 20 Oct 2017 21:31:34 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        ALSA <alsa-devel@...a-project.org>, Mark <broonie@...nel.org>,
        Takashi <tiwai@...e.de>,
        Pierre <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Shreyas NC <shreyas.nc@...el.com>, patches.audio@...el.com,
        alan@...ux.intel.com,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Sagar Dharia <sdharia@...eaurora.org>,
        srinivas.kandagatla@...aro.org, plai@...eaurora.org,
        Sudheer Papothi <spapothi@...eaurora.org>
Subject: Re: [PATCH 02/14] soundwire: Add SoundWire bus type

On Fri, Oct 20, 2017 at 12:45:28PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Oct 19, 2017 at 08:33:18AM +0530, Vinod Koul wrote:
> > +/*
> > + *  This file is provided under a dual BSD/GPLv2 license.  When using or
> > + *  redistributing this file, you may do so under either license.
> > + *
> > + *  GPL LICENSE SUMMARY
> > + *
> > + *  Copyright(c) 2015-17 Intel Corporation.
> > + *
> > + *  This program is free software; you can redistribute it and/or modify
> > + *  it under the terms of version 2 of the GNU General Public License as
> > + *  published by the Free Software Foundation.
> > + *
> > + *  This program is distributed in the hope that it will be useful, but
> > + *  WITHOUT ANY WARRANTY; without even the implied warranty of
> > + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + *  General Public License for more details.
> > + *
> > + *  BSD LICENSE
> > + *
> > + *  Copyright(c) 2015-17 Intel Corporation.
> > + *
> > + *  Redistribution and use in source and binary forms, with or without
> > + *  modification, are permitted provided that the following conditions
> > + *  are met:
> > + *
> > + *    * Redistributions of source code must retain the above copyright
> > + *      notice, this list of conditions and the following disclaimer.
> > + *    * Redistributions in binary form must reproduce the above copyright
> > + *      notice, this list of conditions and the following disclaimer in
> > + *      the documentation and/or other materials provided with the
> > + *      distribution.
> > + *    * Neither the name of Intel Corporation nor the names of its
> > + *      contributors may be used to endorse or promote products derived
> > + *      from this software without specific prior written permission.
> > + *
> > + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> > + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> > + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> > + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> > + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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> 
> Are you _sure_ that code that interacts with the driver core can have a
> dual-license here?  Have you explained to lawyers what you are doing
> here (wrapping gpl-only symbols with non-gpl-only exports)?

Sorry, the intention is not to wrap gpl symbols for non-gpl-only exports.

> And why dual license something that will only ever work on Linux?

We have non Linux users (mostly RTOS folks) which we would like to support
with as much as common code.

> And finally, put a real SPDX header up there so that people don't have
> to parse that horrid amount of text to try to determine exactly what
> that license is.

Sorry for confusion, For the record we are trying to do Dual GPL v2/ BSD 3
clause here. Can you give me example of SPDX use. I will be gald to use that

> > +struct bus_type sdw_bus_type = {
> > +	.name = "soundwire",
> > +	.match = sdw_bus_match,
> > +	.uevent = sdw_uevent,
> > +};
> > +EXPORT_SYMBOL(sdw_bus_type);
> 
> EXPORT_SYMBOL_GPL()?

This can be EXPORT_SYMBOL_GPL as non Linux users wont have this. But then
would it be to okay to have a module with some symbols _GPL and some non
_GPL (the SoundWire protocol ones would need to be non GPL)

> 
> No release callback?  Who frees the device?

Sorry to have missed that, will add that

> > +static int sdw_drv_remove(struct device *dev)
> > +{
> > +	struct sdw_slave *slave = dev_to_sdw_dev(dev);
> > +	struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
> > +
> > +	if (drv->remove)
> > +		drv->remove(slave);
> 
> No catching the error value?

will add

> > +/*
> > + * sdw_unregister_driver: unregisters the SoundWire Slave driver
> > + *
> > + * @drv: driver to unregister
> > + */
> > +void sdw_unregister_driver(struct sdw_driver *drv)
> > +{
> > +	driver_unregister(&drv->driver);
> > +}
> > +EXPORT_SYMBOL(sdw_unregister_driver);
> 
> EXPORT_SYMBOL_GPL()?  Same for all the exports here (I have to ask,
> especially given what you are wrapping...)

-- 
~Vinod