Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759134Ab2K3Sdt (ORCPT ); Fri, 30 Nov 2012 13:33:49 -0500 Received: from merlin.infradead.org ([205.233.59.134]:54184 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757187Ab2K3Sds (ORCPT ); Fri, 30 Nov 2012 13:33:48 -0500 Message-ID: <1354300414.21562.306.camel@shinybook.infradead.org> Subject: Re: [PATCH v2 3/3] pppoatm: protect against freeing of vcc From: David Woodhouse To: Krzysztof Mazur Cc: "Chas Williams (CONTRACTOR)" , David Laight , davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, nathan@traverse.com.au Date: Fri, 30 Nov 2012 18:33:34 +0000 In-Reply-To: <20121130170007.GA25818@shrek.podlesie.net> References: <201211300138.qAU1c8sE003388@thirdoffive.cmf.nrl.navy.mil> <1354240620.21562.256.camel@shinybook.infradead.org> <1354263922.21562.270.camel@shinybook.infradead.org> <20121130095354.GA15126@shrek.podlesie.net> <1354277415.21562.284.camel@shinybook.infradead.org> <1354292626.21562.298.camel@shinybook.infradead.org> <20121130170007.GA25818@shrek.podlesie.net> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-hKpTRqEEWI1royRE6YdA" X-Mailer: Evolution 3.6.1 (3.6.1-1.fc18) Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9701 Lines: 151 --=-hKpTRqEEWI1royRE6YdA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2012-11-30 at 18:00 +0100, Krzysztof Mazur wrote: > On Fri, Nov 30, 2012 at 04:23:46PM +0000, David Woodhouse wrote: > >=20 > > +static void br2684_release_cb(struct atm_vcc *atmvcc) > > +{ > > + struct br2684_vcc *brvcc =3D BR2684_VCC(atmvcc); > > + > > + /* > > + * A race with br2684_xmit_vcc() might cause a spurious wakeup just > > + * after that function *stops* the queue, and qspace might actually > > + * go negative before the queue stops again. We cope with that. > > + */ >=20 > We cannot race with br2684_xmit_vcc() because both br2684_xmit_vcc() > and br2684_release_cb() are called with locked sk->sk_lock.slock. Ah, right. For some reason I thought the lock was already dropped when ->release_cb() was called. In that case I'll remove the comment. 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