linux-kernel - Re: [PATCH v3 0/2] Fix uevent race in register

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Message-Id: <20110516.141158.1777924960833804150.davem@davemloft.net>
Date:	Mon, 16 May 2011 14:11:58 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kvalo@...rom.com
Cc:	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] Fix uevent race in register_netdevice()

From: Kalle Valo <kvalo@...rom.com>
Date: Mon, 16 May 2011 17:46:30 +0300

> I'm trying to fix a race in register_netdevice(). The problem is that
> there's a uevent to userspace before the netdevice is ready for use. The
> problem is described here:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=15606
> 
> I have sent few different ways to fix this, but none of them have been
> really usable. Now I came up with a way which changes the driver core
> to make it possible send the uevent in a separate call. This is a clean
> and safe way to fix the race. Downside is that two new functions are
> added to the driver core interface.
> 
> Please comment.

This doesn't work.

The sysfs file will still be there before the uevent, so any
process can go in there, and see the inconsistent state.
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