Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753481Ab2E2KLR (ORCPT ); Tue, 29 May 2012 06:11:17 -0400 Received: from casper.infradead.org ([85.118.1.10]:52887 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753082Ab2E2KLQ (ORCPT ); Tue, 29 May 2012 06:11:16 -0400 Message-ID: <1338286268.11518.157.camel@shinybook.infradead.org> Subject: Re: [PATCH] netwinder: nw_gpio_lock is a raw_spinlock_t From: David Woodhouse To: Christian Dietrich Cc: Artem Bityutskiy , Arnd Bergmann , Greg Kroah-Hartman , Jaroslav Kysela , Takashi Iwai , Dmitry Eremin-Solenikov , David Howells , linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, alsa-devel@alsa-project.org, vamos-dev@lists.cs.fau.de Date: Tue, 29 May 2012 11:11:08 +0100 In-Reply-To: <20120529100619.GA23186@faui49q.informatik.uni-erlangen.de> References: <1338040464.2525.38.camel@koala> <20120525082812.GA12238@faui49q.informatik.uni-erlangen.de> <20120529100619.GA23186@faui49q.informatik.uni-erlangen.de> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-Ybn23zz+8glU2TRHavaH" X-Mailer: Evolution 3.2.3 (3.2.3-3.fc16) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9540 Lines: 144 --=-Ybn23zz+8glU2TRHavaH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2012-05-29 at 12:06 +0200, Christian Dietrich wrote: > Since nw_gpio_lock is a raw_spinlock_t it should be used with the > raw_spinlock_* functions and not the spinlock_* variants. Functionally > this is equivalent at the moment, because the raw_spinlock_t is the > first field of spinlock_t, and therefore &nw_gpio_lock =3D=3D > &(nw_gpio_lock->rlock). But when other spinlock_t functions use other > field they read and write random memory. Hm, why are we exposing a raw spinlock to drivers?=20 Should we export a helper function (or macro, I suppose) which does the appropriate locking *and* the GPIO operation? --=20 dwmw2 --=-Ybn23zz+8glU2TRHavaH Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 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