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Subject: Re: svn commit: r262972 - head/sys/dev/usb/input
From: Rui Paulo <rpaulo@FreeBSD.org>
In-Reply-To: <5322CCC5.7020608@bitfrost.no>
Date: Fri, 14 Mar 2014 08:22:16 -0700
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To: Hans Petter Selasky <hps@bitfrost.no>
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On 14 Mar 2014, at 02:32, Hans Petter Selasky <hps@bitfrost.no> wrote:

> On 03/14/14 03:15, Rui Paulo wrote:
>> On 10 Mar 2014, at 01:52, Hans Petter Selasky <hselasky@freebsd.org> =
wrote:
>>=20
>>> Author: hselasky
>>> Date: Mon Mar 10 08:52:30 2014
>>> New Revision: 262972
>>> URL: http://svnweb.freebsd.org/changeset/base/262972
>>>=20
>>> Log:
>>>  Ignore USB keyboard driver calls from critical sections.
>>>=20
>>>  Reported by:	Oliver Pinter <oliver.pntr@gmail.com>
>>>  MFC after:	1 week
>>>=20
>>> Modified:
>>>  head/sys/dev/usb/input/ukbd.c
>>>=20
>>> Modified: head/sys/dev/usb/input/ukbd.c
>>> =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
>>> --- head/sys/dev/usb/input/ukbd.c	Mon Mar 10 06:41:48 2014	=
(r262971)
>>> +++ head/sys/dev/usb/input/ukbd.c	Mon Mar 10 08:52:30 2014	=
(r262972)
>>> @@ -1909,6 +1909,12 @@ ukbd_ioctl(keyboard_t *kbd, u_long cmd,
>>> 	int result;
>>>=20
>>> 	/*
>>> +	 * XXX Check of someone is calling us from a critical section:
>>> +	 */
>>> +	if (curthread->td_critnest !=3D 0)
>>> +		return (EDEADLK);
>>=20
>> Shouldn't this panic?
>>=20
>> --
>> Rui Paulo
>>=20
>=20
> Hi,
>=20
> This happens on shutdown, in some special case. Not sure if panic at =
shutdown is appropriate?

I thought this was a programming error.  Do we know the special cases =
and why it happens?

--
Rui Paulo