From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756735AbbBQKkK (ORCPT ); Tue, 17 Feb 2015 05:40:10 -0500 Received: from down.free-electrons.com ([37.187.137.238]:33440 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756718AbbBQKkE (ORCPT ); Tue, 17 Feb 2015 05:40:04 -0500 Date: Tue, 17 Feb 2015 11:37:40 +0100 From: Maxime Ripard To: Robert Jarzmik Cc: Gregory Clement , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Ezequiel Garcia , Brian Norris , Lior Amsalem , Tawfik Bayouk , Thomas Petazzoni , Seif Mazareeb , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Sudhakar Gundubogula , Nadav Haklai , Boris Brezillon , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 1/2] mtd: nand: pxa3xx: Fix PIO FIFO draining Message-ID: <20150217103740.GK25269@lukather> References: <1424091072-7738-1-git-send-email-maxime.ripard@free-electrons.com> <1424091072-7738-2-git-send-email-maxime.ripard@free-electrons.com> <87oaotaa6r.fsf@free.fr> <20150216205825.GG25269@lukather> <87k2zha69p.fsf@free.fr> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="AYsPlKobQGgtCvjI" Content-Disposition: inline In-Reply-To: <87k2zha69p.fsf@free.fr> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --AYsPlKobQGgtCvjI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Feb 16, 2015 at 10:36:02PM +0100, Robert Jarzmik wrote: > diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nan= d.c > index e512902..6e569e9 100644 > --- a/drivers/mtd/nand/pxa3xx_nand.c > +++ b/drivers/mtd/nand/pxa3xx_nand.c > @@ -576,11 +576,20 @@ static void start_data_dma(struct pxa3xx_nand_info = *info) > {} > #endif > =20 > +static irqreturn_t pxa3xx_nand_irq_thread(int irq, void *data) > +{ > + struct pxa3xx_nand_info *info =3D data; > + > + handle_data_pio(info); > + return IRQ_HANDLED; > +} > + > static irqreturn_t pxa3xx_nand_irq(int irq, void *devid) > { > struct pxa3xx_nand_info *info =3D devid; > unsigned int status, is_completed =3D 0, is_ready =3D 0; > unsigned int ready, cmd_done; > + irqreturn_t ret =3D IRQ_HANDLED; > =20 > if (info->cs =3D=3D 0) { > ready =3D NDSR_FLASH_RDY; > @@ -622,7 +631,7 @@ static irqreturn_t pxa3xx_nand_irq(int irq, void *dev= id) > } else { > info->state =3D (status & NDSR_RDDREQ) ? > STATE_PIO_READING : STATE_PIO_WRITING; > - handle_data_pio(info); > + ret =3D IRQ_WAKE_THREAD; > } > } > if (status & cmd_done) { > @@ -663,7 +672,7 @@ static irqreturn_t pxa3xx_nand_irq(int irq, void *dev= id) > if (is_ready) > complete(&info->dev_ready); > NORMAL_IRQ_EXIT: > - return IRQ_HANDLED; > + return ret; > } > =20 > static inline int is_buf_blank(uint8_t *buf, size_t len) > @@ -1688,7 +1697,8 @@ static int alloc_nand_resource(struct platform_devi= ce *pdev) > /* initialize all interrupts to be disabled */ > disable_int(info, NDSR_MASK); > =20 > - ret =3D request_irq(irq, pxa3xx_nand_irq, 0, pdev->name, info); > + ret =3D request_threaded_irq(irq, pxa3xx_nand_irq, > + pxa3xx_nand_irq_thread, 0, pdev->name, info); > if (ret < 0) { > dev_err(&pdev->dev, "failed to request IRQ\n"); > goto fail_free_buf; I just gave this patch a try, and it blows up quite badly: http://code.bulix.org/p96krc-87889?raw It looks like there's more work here, most likely in the waitqueues wake up. Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com --AYsPlKobQGgtCvjI Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU4xn0AAoJEBx+YmzsjxAgFJgQAI3MRWw8AJC5h3/73EvQxAQA XDADOSy2C7oSvvYBHJkcJXTF/teOgO/QdOJwuKLSv3S41y7PVeuS2z1oJFhljGMI izbNClwxGGt/llxujxN4qkOLTv+UV0RGuK/rCESyzyt7SWfEHJTXUSG7RYsxycJ9 kmaYhO6h7Nzxc6RfXDctmyEAqciuHlWo7DvKVcaRHF/Wac/8vluZLdH1/4CuPaqs KchgCu2oyzQ7YUsuyn75Gy8P/umB1srj/blM0nkrZ/dbstvTPwcrYRa0ZWJoJRDw o8P/TCQWMIwE2YUpIc8HPWftiOwyBs8Qan4wcNA5jRQnB5AOxWLyqa61yCd/faTw WyLYq7GsWzrhDe1HlfdWlrYhixdkKKcBLA24NqbPUO/Du7ZGTN0jyqUTFgnYUIX9 JUCBl16c8YATIV/cUqGmob+3oN8IXxkqwIz189wuqO68AriZxsqOZdswrqYaN2kG OT33aYAHaIiRuOSmo56qgOv4mEEjBn+Luqhp3QHgR2hueb9kfUbTYnCxBn5qQImE l/3KS2sG+z79fdunSZLCost+y9Svju74WSKOmecl2xCdTkC/6KLUCv1E/0n5kk+d 4T9W4Xc9AM58WxVc0KDAPRCbwtvufZIKU75khSn5xkaQULledaPE0YxzJLX4JuqD 5gW/Xp6YP7ZYTgmgWg+x =br9e -----END PGP SIGNATURE----- --AYsPlKobQGgtCvjI--