Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753605Ab2E2Kwo (ORCPT ); Tue, 29 May 2012 06:52:44 -0400 Received: from casper.infradead.org ([85.118.1.10]:53447 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751271Ab2E2Kwn (ORCPT ); Tue, 29 May 2012 06:52:43 -0400 Message-ID: <1338288752.11518.166.camel@shinybook.infradead.org> Subject: Re: [PATCH] netwinder: nw_gpio_lock is a raw_spinlock_t From: David Woodhouse To: Christian Dietrich , linux-arm-kernel@lists.infradead.org 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 11:52:32 +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="=-8Sp83liX3Xv4JUCVFIOl" 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: 10023 Lines: 159 --=-8Sp83liX3Xv4JUCVFIOl Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2012-05-29 at 12:06 +0200, Christian Dietrich wrote: > --- a/drivers/char/ds1620.c > +++ b/drivers/char/ds1620.c > @@ -74,21 +74,21 @@ static inline void netwinder_ds1620_reset(void) > =20 > static inline void netwinder_lock(unsigned long *flags) > { > - spin_lock_irqsave(&nw_gpio_lock, *flags); > + raw_spin_lock_irqsave(&nw_gpio_lock, *flags); > } > =20 > static inline void netwinder_unlock(unsigned long *flags) > { > - spin_unlock_irqrestore(&nw_gpio_lock, *flags); > + raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags); > }=20 If you were to make these functions public by shifting them into arch/arm/mach-footbridge/include/mach/hardware.h that would be a lot nicer, and other places wouldn't have to touch the raw spinlock directly. Also... while we're thinking about preemption and netwinder, note that the write enable is valid for only 2ms or so. So all the functions in dc21285.c that you just touched should probably *also* be disabling preemption when they're run on a netwinder, to ensure that that time doesn't expire before they actually get to run. --=20 dwmw2 --=-8Sp83liX3Xv4JUCVFIOl 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 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