linux-kernel - Re: [PATCH] net: dev: Add API to check net

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Message-ID: <20200726194528.GC1661457@lunn.ch>
Date:   Sun, 26 Jul 2020 21:45:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ilia Lin <ilial@...eaurora.org>
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...lanox.com,
        edumazet@...gle.com, ap420073@...il.com, xiyou.wangcong@...il.com,
        maximmi@...lanox.com, ilia.lin@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dev: Add API to check net_dev readiness

On Sun, Jul 26, 2020 at 10:37:54PM +0300, Ilia Lin wrote:
> From: Ilia Lin <ilia.lin@...nel.org>
> 
> Add an API that returns true, if the net_dev_init was already called,
> and the driver was initialized.
> 
> Some early drivers, that are initialized during the subsys_initcall
> may try accessing the net_dev or NAPI APIs before the net_dev_init,
> and will encounter a kernel bug. This API provides a way to handle
> this and manage by deferring or by other way.

Hi Ilia

You need to include a user of this new API.

I also have to wonder why a network device driver is being probed the
subsys_initcall.

    Andrew