netdev - Re: [PATCH V2 net-next 2/8] net: hns3: Add support of the HNAE3 framework

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Message-ID: <20170617121111.GA1974@lunn.ch>
Date:   Sat, 17 Jun 2017 14:11:11 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        huangdaode <huangdaode@...ilicon.com>,
        "lipeng (Y)" <lipeng321@...wei.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH V2 net-next 2/8] net: hns3: Add support of the HNAE3
 framework

> > > +subsys_initcall(hnae3_init);
> > 
> > And the point of this is?
> > 
> >     Andrew
> This looks weird but not sure how we could have made sure HNAE is available before other
> 2 drivers could have loaded. Changing into module_init() means two other modules (dependent
> upon hnae) if loaded first will experience load time linking problems. Do you think this
> is okay? 

Often the best way to decide if something is sensible is to see if
lots of other drivers do the same. Can you point to other drivers
doing this?

depmod/modprobe will actually sort this out for you. depmod looks at
the symbols exported and required for each module and builds a
dependency tree. When you modprobe a driver, it looks at the
dependency tree, and loads any drivers needed in order to fulfil the
dependencies.

	Andrew