linux-kernel - Re: [PATCH 2/3] memory: mtk-smi: Add module_exit and module

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Message-ID: <1611641524.5302.10.camel@mhfsdcap03>
Date:   Tue, 26 Jan 2021 14:12:04 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>, Tomasz Figa <tfiga@...gle.com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <youlin.pei@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <yi.kuo@...iatek.com>
Subject: Re: [PATCH 2/3] memory: mtk-smi: Add module_exit and module_license

On Mon, 2021-01-25 at 11:40 +0100, Krzysztof Kozlowski wrote:
> On Mon, Jan 25, 2021 at 05:28:05PM +0800, Yong Wu wrote:
> > On Mon, 2021-01-25 at 09:40 +0100, Krzysztof Kozlowski wrote:
> > > On Mon, Jan 25, 2021 at 02:49:41PM +0800, Yong Wu wrote:
> > > > On Fri, 2021-01-22 at 22:34 +0100, Krzysztof Kozlowski wrote:
> > > > > On Thu, Jan 21, 2021 at 02:24:28PM +0800, Yong Wu wrote:
> > > > > > The config MTK_SMI always depends on MTK_IOMMU which is built-in
> > > > > > currently. Thus we don't have module_exit before. This patch adds
> > > > > > module_exit and module_license. It is a preparing patch for supporting
> > > > > > MTK_SMI could been built as a module.
> > > > > > 
> > > > > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > > > > ---
> > > > > >  drivers/memory/mtk-smi.c | 10 ++++++++++
> > > > > >  1 file changed, 10 insertions(+)
> > > > > > 
> > > > > > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> > > > > > index e2aebd2bfa8e..aa2a25abf04f 100644
> > > > > > --- a/drivers/memory/mtk-smi.c
> > > > > > +++ b/drivers/memory/mtk-smi.c
> > > > > > @@ -597,3 +597,13 @@ static int __init mtk_smi_init(void)
> > > > > >  	return platform_register_drivers(smidrivers, ARRAY_SIZE(smidrivers));
> > > > > >  }
> > > > > >  module_init(mtk_smi_init);
> > > > > > +
> > > > > > +static void __exit mtk_smi_exit(void)
> > > > > > +{
> > > > > > +	platform_unregister_drivers(smidrivers, ARRAY_SIZE(smidrivers));
> > > > > > +}
> > > > > > +module_exit(mtk_smi_exit);
> > > > > > +
> > > > > > +MODULE_DESCRIPTION("MediaTek SMI driver");
> > > > > > +MODULE_ALIAS("platform:MediaTek-SMI");
> > > > > 
> > > > > Drivers do not use capital letters, so I have doubts whether this alias
> > > > > is correct.
> > > > 
> > > > I didn't care the upper/lower-case. I will change to lower case in next
> > > > time.
> > > 
> > > Then why do you need the alias? The name does not match driver name, so
> > > what's the purpose of this alias/
> > 
> > I think it is not so necessary for us. I will delete this line in next
> > version.
> > 
> > Only curious what's alias is fit in our case? normally it should be the
> > file name: mtk-smi?
> 
> If autoloading of your module works, then remove it. The alias is
> necessary for some cases when a device table is missing (e.g. platform
> driver is matched via devicetree but not having the platform_device_id
> table) or matching is done via different method (e.g. driver is matched
> from MFD via devicetree compatible even though there is a
> platform_device_id table).

Thanks for explaination so detailly. v2 is sent just now.

> 
> Best regards,
> Krzysztof