linux-kernel - Re: 2.6.26-rc1: warnings from sysfs, bluetooth related

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Message-ID: <20080515181737.GC21623@elf.ucw.cz>
Date:	Thu, 15 May 2008 20:17:37 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>, gregkh@...e.de,
	marcel@...tmann.org, linux-bluetooth@...r.kernel.org
Subject: Re: 2.6.26-rc1: warnings from sysfs, bluetooth related

Hi!

> > I'm getting these from rfcomm...
> 
> 
> Are you sure it's a regression?

No, I'm not sure it is an regression. I have not seen it in a while,
and I seen it on -rc1. It does not seem to be too repeatable.

> Dont know if it's same bug as BUG 10341.  I just describe the problem
> in bug 10341:
> 
> While a rfcomm device is opened more than once, the BUG 10341 can be triggered.
> 
> rfcomm dev reference will be held for every rfcomm_tty_open, but release_dev
>  will hangup the tty and release the dev number for free use without
> judge the dev->opened.
> 
> rfcomm_dev_state_change and rfcomm_tty_hangup could del the rfcomm dev
> as well,  the problem is similar as above.
> 
> If the create_dev called before the last tty_close,  sysfs will
> warning and create will fail.
> 
> I have a patch which don't hold the dev reference in rfcomm_tty_open,
> but it need some review and test.
> 
> please see:
> http://bugzilla.kernel.org/attachment.cgi?id=15746
> 
> Marcel, do you have idea about this? or other solution?

									Pavel

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