From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from purkki.adurom.net ([80.68.90.206]:55460 "EHLO purkki.adurom.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751869Ab1EGFms (ORCPT ); Sat, 7 May 2011 01:42:48 -0400 To: Stanislaw Gruszka Cc: linux-wireless@vger.kernel.org Subject: Re: iwlagn: crash when unloading the module References: <87iptsgk5y.fsf@purkki.adurom.net> <20110504132602.GA2183@redhat.com> From: Kalle Valo Date: Sat, 07 May 2011 08:42:46 +0300 In-Reply-To: <20110504132602.GA2183@redhat.com> (Stanislaw Gruszka's message of "Wed\, 4 May 2011 15\:26\:03 +0200") Message-ID: <87pqnvf4mh.fsf@purkki.adurom.net> (sfid-20110507_074250_487255_FAC6BC3D) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: Stanislaw Gruszka writes: > On Tue, May 03, 2011 at 01:20:25PM +0300, Kalle Valo wrote: >> I noticed today a crash when removing iwlagn module. I can see the >> crash everytime on my lenovo x201 (x86 64bit, i5) with this wireless >> chip: >> >> [ 19.484551] iwlagn 0000:02:00.0: Detected Intel(R) Centrino(R) >> Ultimate-N 6300 AGN, REV=0x74 [...] > We can not exclude iwlagn problem only triggered with intel iommu, > because problem does not happen with other modules, or does it? I have only seen the crash with iwlagn. But I have to admit that I haven't tried to unload modules that much. > Except test patch pointed by Johannes, I suggest turning on > CONFIG_DMA_API_DEBUG I already had this on and I haven't noticed anything wrong. > and test with intel_iommu=on and intel_iommu=off. I'll skip these as David's patch seem to already help. -- Kalle Valo