From: "Tomas Ögren" <stric@acc.umu.se>
To: Marcel Holtmann <marcel@holtmann.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [2.4] "Fix" introduced in 2.4.27pre2 for bluetooth hci_usb race causes kernel hang
Date: Wed, 13 Apr 2005 12:37:58 +0200 [thread overview]
Message-ID: <20050413103758.GA12780@shaka.acc.umu.se> (raw)
In-Reply-To: <1113053955.9783.57.camel@pegasus>
On 09 April, 2005 - Marcel Holtmann sent me these 1,6K bytes:
> Hi Tomas,
>
> > I have noticed a problem with a race condition fix introduced in
> > 2.4.27-pre2 that causes the kernel to hang when disconnecting a
> > Bluetooth USB dongle or doing 'hciconfig hci0 down'. No message is
> > printed, the kernel just doesn't respond anymore.
> >
> > Seen in Changelog:
> > Marcel Holtmann:
> > o [Bluetooth] Fix race in RX complete routine of the USB drivers
> >
> > Reversing the following patch to hci_usb_rx_complete() makes 2.4.27-pre2
> > up until 2.4.30 happy and does not hang when removing the dongle
> > anymore. (bfusb.c has the same patch applied)
> >
> > 2.6.11.7 does not show the same problem, but has similar code to the
> > "fixed" (that hangs) code in 2.4, so the real problem is probably
> > somewhere else.
>
> does the attached patch makes any difference?
It works just fine with pristine 2.4.30 and this patch. No deadlocks
anymore.
/Tomas
--
Tomas Ögren, stric@acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Umeå
`- Sysadmin at {cs,acc}.umu.se
next prev parent reply other threads:[~2005-04-13 10:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-08 19:56 Tomas Ögren
2005-04-09 13:39 ` Marcel Holtmann
2005-04-13 10:37 ` Tomas Ögren [this message]
2005-04-13 21:28 ` Marcel Holtmann
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