From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752665AbbAMRYr (ORCPT ); Tue, 13 Jan 2015 12:24:47 -0500 Received: from cantor2.suse.de ([195.135.220.15]:42385 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751592AbbAMRYq (ORCPT ); Tue, 13 Jan 2015 12:24:46 -0500 Date: Tue, 13 Jan 2015 18:24:44 +0100 Message-ID: From: Takashi Iwai To: "Wang, Jiada (ESD)" Cc: "lgirdwood@gmail.com" , "broonie@kernel.org" , "perex@perex.cz" , "alsa-devel@alsa-project.org" , "linux-kernel@vger.kernel.org" , "Frkuska, Joshua" Subject: Re: [alsa-devel] unload Audio drivers while playback stream is active case kernel crash In-Reply-To: <857E9EDCA6C0904DB3357321AA9123EB0108B66919@NA-MBX-01.mgc.mentorg.com> References: <857E9EDCA6C0904DB3357321AA9123EB0108B66919@NA-MBX-01.mgc.mentorg.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/24.4 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org At Fri, 9 Jan 2015 11:39:32 +0000, Wang, Jiada (ESD) wrote: > > Hi Community > > I am using i.MX6Q sabreSD board, which have imx_wm892 machine driver, wm8962 codec and SSI CPU DAI, > > I got Kernel crash when unloading audio drivers (playback stream is active) > modprobe -r snd_soc_imx_wm8962 > modprobe -r snd_soc_fsl_ssi > modprobe -r snd_soc_wm8962 [snip] The root problem is that you can unload the module while playing. The corresponding module refcounts should have been increased during used. Do we miss [try_]module_get() somewhere in ASoC? Takashi