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

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Message-ID: <20091007203121.GA432@trillian.comsick.at>
Date:	Wed, 7 Oct 2009 22:31:21 +0200
From:	Michael Guntsche <mike@...loops.com>
To:	Kay Sievers <kay.sievers@...y.org>
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 2009.10.07 22:12:28 , Kay Sievers wrote:
> To be more specific, Michael, can you please run "udevadm monitor" at
> the same time you see this happen?

I started udevadm monitor with the module installed AND all 4 devices
populated. Then I removed the module....

KERNEL[1254947142.220060] remove   /devices/pnp0/00:06/tty/ttyS1 (tty)
UDEV  [1254947142.220121] add
/devices/platform/serial8250/tty/ttyS1 (tty)
KERNEL[1254947142.220161] add
/devices/platform/serial8250/tty/ttyS1 (tty)
UDEV  [1254947142.220857] remove   /devices/pnp0/00:06/tty/ttyS1 (tty)
KERNEL[1254947142.223078] remove   /devices/pnp0/00:05/tty/ttyS0 (tty)
UDEV  [1254947142.223134] add
/devices/platform/serial8250/tty/ttyS0 (tty)
KERNEL[1254947142.223175] add
/devices/platform/serial8250/tty/ttyS0 (tty)
UDEV  [1254947142.223800] remove   /devices/pnp0/00:05/tty/ttyS0 (tty)
KERNEL[1254947142.225369] remove   /bus/pnp/drivers/serial (drivers)
UDEV  [1254947142.225419] remove   /module/8250_pnp (module)
KERNEL[1254947142.225455] remove   /module/8250_pnp (module)
UDEV  [1254947142.225675] remove   /bus/pnp/drivers/serial (drivers)

Afterwards ONLY ttyS2 and ttS3 were under /dev. 

I then added the module again ....

KERNEL[1254947157.330470] add      /module/8250_pnp (module)
UDEV  [1254947157.330521] add      /module/8250_pnp (module)
KERNEL[1254947157.333498] remove
/devices/platform/serial8250/tty/ttyS0 (tty)
KERNEL[1254947157.333550] add      /devices/pnp0/00:05/tty/ttyS0 (tty)
UDEV  [1254947157.334830] add      /devices/pnp0/00:05/tty/ttyS0 (tty)
UDEV  [1254947157.334889] remove
/devices/platform/serial8250/tty/ttyS0 (tty)
KERNEL[1254947157.338967] remove
/devices/platform/serial8250/tty/ttyS1 (tty)
KERNEL[1254947157.339020] add      /devices/pnp0/00:06/tty/ttyS1 (tty)
KERNEL[1254947157.339056] add      /bus/pnp/drivers/serial (drivers)
UDEV  [1254947157.340180] remove
/devices/platform/serial8250/tty/ttyS1 (tty)
UDEV  [1254947157.340753] add      /devices/pnp0/00:06/tty/ttyS1 (tty)
UDEV  [1254947157.341202] add      /bus/pnp/drivers/serial (drivers)

ONLY ttyS1 (and S2, S3) where there.

Kind regards,
Michael
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