linux-kernel - [Bisected] [Bug #13821] Replugging USB serial converter uses new device node

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Message-ID: <20090727022623.GA6614@Pilar.aei.mpg.de>
Date:	Mon, 27 Jul 2009 04:26:23 +0200
From:	"Carlos R. Mafra" <crmafra2@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Ferenc Wagner <wferi@...f.hu>,
	Kay Sievers <kay.sievers@...y.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [Bisected] [Bug #13821] Replugging USB serial converter uses new
	device node

On Sun 26.Jul'09 at 22:28:27 +0200, Rafael J. Wysocki wrote:
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13821
> Subject		: Replugging USB serial converter uses new device node
> Submitter	: Ferenc Wagner <wferi@...f.hu>
> Date		: 2009-07-18 20:04 (9 days old)
> References	: http://marc.info/?l=linux-kernel&m=124794754015776&w=4

I was scanning the regressions list and noticed that I could reproduce
this bug.

So I bisected it to commit 335f8514f200e63d689113d29cb7253a5c282967
("tty: Bring the usb tty port structure into more use"), from Alan
Cox.

I did not double check if reverting it from -rc4 fixes the issue,
but I noticed that this patch touches drivers/usb/serial/option.c, which
is the driver I used to test this problem.

If there is anything else I can do (give more info, test patches etc),
please let me know.
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