From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.kapsi.fi ([217.30.184.167]:43145 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754163Ab3LVSOH (ORCPT ); Sun, 22 Dec 2013 13:14:07 -0500 Message-ID: <52B72BEB.4010902@iki.fi> Date: Sun, 22 Dec 2013 20:14:03 +0200 From: Antti Palosaari MIME-Version: 1.0 To: =?ISO-8859-1?Q?Frank_Sch=E4fer?= CC: Linux Media Mailing List Subject: Re: em28xx DEADLOCK reported by lock debug References: <52B1C79C.1070408@iki.fi> <52B5C718.7030605@googlemail.com> <52B5F229.6020301@iki.fi> <52B6EE79.9070105@googlemail.com> <52B6F883.8060103@iki.fi> <52B7293C.5010206@googlemail.com> In-Reply-To: <52B7293C.5010206@googlemail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org List-ID: On 22.12.2013 20:02, Frank Schäfer wrote: > Am 22.12.2013 15:34, schrieb Antti Palosaari: >> On 22.12.2013 15:51, Frank Schäfer wrote: >>> Am 21.12.2013 20:55, schrieb Antti Palosaari: >>>> On 21.12.2013 18:51, Frank Schäfer wrote: >>>>> Hi Antti, >>>>> >>>>> thank you for reporting this issue. >>>>> >>>>> Am 18.12.2013 17:04, schrieb Antti Palosaari: >>>>>> That same lock debug deadlock is still there (maybe ~4 times I report >>>>>> it during 2 years). Is that possible to fix easily at all? >>>>> >>>>> Patches are always welcome. ;) >>>> >>>> haha, I cannot simply learn every driver I meet some problems... >>> Hint: >>> >>> If you report a bug ~4 times in 2 years but never get a reply, it >>> usually means >>> a) nobody cares >>> b) nobody has the resources (time, knowledge) to fix it. >>> >>> So you either have to live with this issue or to fix it yourself. >> >> OK, as you request me to fix it, I will fix that by making DVB USB v2 >> driver for these em28xx devices I have added. >> >> It should not be very much work as em28xx protocol is still relatively >> easy. > How would that help to get those lockdep false warnings fixed ? > Btw: these warnings should appear for _all_ em28xx extensions (dvb, > input, audio). I am already looking to silence that v4l2 lockdep report. It is hard to say how much it is work as I simply don't know even reasons. I suspect that if I start learning and fixing em28xx driver it will take week or two as a workload. Writing new dvb-usb driver is only max 2 days of work and as a bonus you will get some missing features for free: 1) power-management 2) suspend/resume 3) PID filters regards Antti -- http://palosaari.fi/