linux-kernel - Re: [BUG] No ttyS0 - Strange udev 8250

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Message-ID: <ac3eb2510910071353v3bbe5bc7lc41e184fbc1ff7ed@mail.gmail.com>
Date:	Wed, 7 Oct 2009 22:53:12 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Michael Guntsche <mike@...loops.com>
Cc:	Alan Jenkins <sourcejedi.lkml@...glemail.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-hotplug <linux-hotplug@...r.kernel.org>
Subject: Re: [BUG] No ttyS0 - Strange udev 8250_pnp interaction

On Wed, Oct 7, 2009 at 22:31, Michael Guntsche <mike@...loops.com> wrote:
> add      /module/8250_pnp (module)
> remove /devices/platform/serial8250/tty/ttyS0 (tty)
> add      /devices/pnp0/00:05/tty/ttyS0 (tty)

That's pretty odd, that the loading of a module removes pre-existing
devices created by other code, and creates new ones with the same name
and major/minor.

As Alan mentioned, we could serialize events which carry the the same
major/minor number, that should work around such behavior.

Thanks,
Kay
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