linux-kernel - Re: [PATCH] coresight: replicator: Use module_platform

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Message-ID: <CANLsYkyezD9wimwxZJtWuJgR=mW5eurMfMhOD7ospPNBYar6_Q@mail.gmail.com>
Date:	Wed, 8 Jul 2015 08:27:20 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Vaishali Thakkar <vthakkar1994@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] coresight: replicator: Use module_platform_driver

On 6 July 2015 at 23:26, Vaishali Thakkar <vthakkar1994@...il.com> wrote:
> Use module_platform_driver for drivers whose init and exit functions
> only register and unregister, respectively.
>
> A simplified version of the Coccinelle semantic patch that performs
> this transformation is as follows:
>
> @a@
> identifier f, x;
> @@
> -static f(...) { return platform_driver_register(&x); }
>
> @b depends on a@
> identifier e, a.x;
> @@
> -static e(...) { platform_driver_unregister(&x); }
>
> @c depends on a && b@
> identifier a.f;
> declarer name module_init;
> @@
> -module_init(f);
>
> @d depends on a && b && c@
> identifier b.e, a.x;
> declarer name module_exit;
> declarer name module_platform_driver;
> @@
> -module_exit(e);
> +module_platform_driver(x);
>
> Signed-off-by: Vaishali Thakkar <vthakkar1994@...il.com>
> ---
>  drivers/hwtracing/coresight/coresight-replicator.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 7974b7c..df45932 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -183,18 +183,7 @@ static struct platform_driver replicator_driver = {
>                 .pm     = &replicator_dev_pm_ops,
>         },
>  };
> -
> -static int __init replicator_init(void)
> -{
> -       return platform_driver_register(&replicator_driver);
> -}
> -module_init(replicator_init);
> -
> -static void __exit replicator_exit(void)
> -{
> -       platform_driver_unregister(&replicator_driver);
> -}
> -module_exit(replicator_exit);
> +module_platform_driver(replicator_driver);
>
>  MODULE_LICENSE("GPL v2");
>  MODULE_DESCRIPTION("CoreSight Replicator driver");
> --
> 1.9.1
>

I agree with this patch but please remove the comment about Coccinelle
in the commit log (along with the code) and add a newline before
module_platform_driver().

Thanks,
Mathieu
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