linux-kernel - Re: [PATCH v7 1/6] fieldbus_dev: add Fieldbus Device subsystem.

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Date:   Tue, 22 Jan 2019 18:12:31 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>,
        Sven Van Asbroeck <thesven73@...il.com>
Cc:     svendev@...x.com, robh+dt@...nel.org, linus.walleij@...aro.org,
        lee.jones@...aro.org, mark.rutland@....com, treding@...dia.com,
        david@...hnology.com, noralf@...nnes.org, johan@...nel.org,
        monstr@...str.eu, michal.vokac@...ft.com, arnd@...db.de,
        gregkh@...uxfoundation.org, john.garry@...wei.com,
        geert+renesas@...der.be, robin.murphy@....com,
        sebastien.bourdelin@...oirfairelinux.com, icenowy@...c.io,
        stuyoder@...il.com, maxime.ripard@...tlin.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/6] fieldbus_dev: add Fieldbus Device subsystem.

Am 22.01.19 um 17:56 schrieb Paul Gortmaker:
> [[PATCH v7 1/6] fieldbus_dev: add Fieldbus Device subsystem.] On 22/01/2019 (Tue 10:21) Sven Van Asbroeck wrote:
> 
>> Fieldbus device (client) adapters allow data exchange with a PLC aka.
>> "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.)
>>
>> They are typically used when a Linux device wants to expose itself
>> as an actuator, motor, console light, switch, etc. over the fieldbus.
>>
>> This framework is designed to provide a generic interface to Fieldbus
>> Devices from both the Linux Kernel and the userspace.
>>
>> Signed-off-by: Sven Van Asbroeck <TheSven73@...glemail.com>
> 
> [...]
> 
>> diff --git a/drivers/fieldbus/Kconfig b/drivers/fieldbus/Kconfig
>> new file mode 100644
>> index 000000000000..5c2bef950d04
>> --- /dev/null
>> +++ b/drivers/fieldbus/Kconfig
>> @@ -0,0 +1,19 @@
>> +menuconfig FIELDBUS_DEV
>> +	bool "Fieldbus Device Support"
> 
> OK, so the core support is NOT tristate, ie not modular,

Is that intentional though, and if so, why?

If possible, I would much rather see it changed to tristate and leave
all the metadata below.

> so I think...
> 
>> diff --git a/drivers/fieldbus/dev_core.c b/drivers/fieldbus/dev_core.c
>> new file mode 100644
>> index 000000000000..c816df3201bb
>> --- /dev/null
>> +++ b/drivers/fieldbus/dev_core.c
>> @@ -0,0 +1,348 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Fieldbus Device Driver Core
>> + *
>> + */
>> +
>> +#include <linux/fieldbus_dev.h>
>> +#include <linux/mutex.h>
>> +#include <linux/module.h>
> 
> ...you don't need module.h here
> 
>> +#include <linux/device.h>
>> +#include <linux/idr.h>
>> +#include <linux/fs.h>
>> +#include <linux/slab.h>
>> +#include <linux/poll.h>
>> +
> 
> [...]
> 
>> +
>> +static void __exit fieldbus_exit(void)
>> +{
>> +	unregister_chrdev_region(fieldbus_devt, MAX_FIELDBUSES);
>> +	class_unregister(&fieldbus_class);
>> +}
>> +
>> +subsys_initcall(fieldbus_init);
>> +module_exit(fieldbus_exit);
> 
> ...and the module_exit is never called, so fieldbus_exit is dead code
> and hence both should be removed.
> 
>> +
>> +MODULE_AUTHOR("Sven Van Asbroeck <TheSven73@...glemail.com>");
>> +MODULE_AUTHOR("Jonathan Stiles <jonathans@...x.com>");
>> +MODULE_DESCRIPTION("Fieldbus Device Driver Core");
>> +MODULE_LICENSE("GPL v2");

Sven, as this code appears to be all by ArcX people, any chance you can
make it just GPL (SPDX GPL-2.0-or-later)? Only reason to have it v2-only
would be if this code was derived from v2-only code that can't be
relicensed anymore.

Thanks,
Andreas

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