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

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Message-ID: <ac3eb2510910071306r4ad6dc9btb7503bc3ab0ec815@mail.gmail.com>
Date:	Wed, 7 Oct 2009 22:06:13 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
Cc:	Michael Guntsche <mike@...loops.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 21:46, Alan Jenkins
<sourcejedi.lkml@...glemail.com> wrote:
> Udev would have avoided the race prior to
>
> 82c785e "udevd: remove check for dev_t, DEVPATH_OLD takes care of that"
>
> (the "check" removed here used to serialize events based on the device
> major:minor number).
>
> So - udev probably needs to add the check back.

What are the two devices with the same major/minor but a different DEVPATH?

> It might also be the case that future kernels could set DEVPATH_OLD as
> suggested.  I don't know the gory details of 8250_pnp though.

The DEVPATH_OLD is only added when one and the same device was renamed
or moved, which isn't the case here, I guess?

Kay
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