From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from latitanza.investici.org ([82.94.249.234]:39469 "EHLO latitanza.investici.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757293Ab2EATBg (ORCPT ); Tue, 1 May 2012 15:01:36 -0400 Date: Tue, 1 May 2012 20:33:22 +0200 From: Antonio Quartulli To: "Venkataraman, Meenakshi" Cc: "John W. Linville" , "linux-wireless@vger.kernel.org" , "Emmanuel Grumbach (egrumbach@gmail.com)" Subject: Re: iwlwifi warn_slowpath with 3.* Message-ID: <20120501183322.GF4316@ritirata.org> (sfid-20120501_210140_556266_DC937CCD) References: <20120422182928.GA2854@ritirata.org> <20120430145803.GE2630@ritirata.org> <20120430170337.GA2560@tuxdriver.com> <4595B4D22AB93C4FABBA84AAD5AA37FD143115@ORSMSX103.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="LZFKeWUZP29EKQNE" In-Reply-To: <4595B4D22AB93C4FABBA84AAD5AA37FD143115@ORSMSX103.amr.corp.intel.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: --LZFKeWUZP29EKQNE Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, May 01, 2012 at 04:52:23PM +0000, Venkataraman, Meenakshi wrote: > Hi John, Antonio, >=20 > Emmanuel found a race condition in rx buffer allocation/deallocation, and= attached is a patch that fixes it. >=20 > >> > since linux-3.0 (I don't remember if it was the case even before), > >> > I'm getting this output in dmesg: > >> > > >> > [ 53.662990] ------------[ cut here ]------------ > >> > [ 53.663016] WARNING: at drivers/iommu/intel-iommu.c:2911 > >> > intel_unmap_page+0x14b/0x180() > >> > [ 53.663047] Hardware name: Latitude E5420 > >> > [ 53.663066] Driver unmaps unmatched page at PFN ffd1a000 > >> > >> > >> I see that I always get the same addr passed to the unmap function: > >> > >> [ 23.950535] Driver unmaps unmatched page at PFN ffd1a000 > >> > >> is it a coincidence? > >> I'm running linux-3.3.3 right now. I can try wireless-testing if it wo= uld help. >=20 > [MV] Antonio -- can you try out the patch attached and let us know if you= continue to see the problem? Ok, I will first try with a plain wireless-testing kernel and then I will a= pply the patch. Thanks! --=20 Antonio Quartulli =2E.each of us alone is worth nothing.. Ernesto "Che" Guevara --LZFKeWUZP29EKQNE Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iQEcBAEBAgAGBQJPoCxyAAoJEFMQTLzJFOZFmlEH/RQ74pb5eZSuVJrMG6I5lAJ8 9JnDcxBALMVUzi3ucUDX/4nvYmuXF5PkLNEU+3jbVT6Hei3K26W6MOf1C00YuCmc 5OaBsEFyfyrw4GZ4hNmzz5pbIr0B0Ei47lMRPFFOTnvuZMixV172AgwKpM9Vmh53 2OxieXm30XGbIIiJO9wf29rciEIoF/JalUzMa6UDhoBjmRFfaGJYaaweLatrfbqt qYI5+zmGEKT4isvZQQzOyQNV3aizYK6hKHr5cm+A9fPoJJehiwaLhFQ9ntc+pP+9 N7vfFm0qmQApHsYjt9DIC3SBp4RvnTeI0/9PKJZ6Z90X472E20EFXSD8VSwDdxA= =NovH -----END PGP SIGNATURE----- --LZFKeWUZP29EKQNE--