From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F26C7C43381 for ; Mon, 4 Mar 2019 08:35:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2B2C20836 for ; Mon, 4 Mar 2019 08:35:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551688524; bh=1AQyJefjqICQvaUcCxu7U4iQtSFS8/RWRCVpUZQg3HA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yoCh1VsWqo1zYZVkoLUCpvT3o64yxO9F7GgRr7fKkC1cxL0ZIjaLukZSfAvP4ua1f ob4r1JkJd24tMLvBrwRzuYjz1Eot4hw23uu5RlJwW8H4sM/7MC3jdoFJfSh+qxgv2Q dPiEZ7ukPF6h9J9gshOfCEOdckPC8ihxV/vAqL3E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727798AbfCDIfW (ORCPT ); Mon, 4 Mar 2019 03:35:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:43098 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728426AbfCDIfS (ORCPT ); Mon, 4 Mar 2019 03:35:18 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C7BD220836; Mon, 4 Mar 2019 08:35:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551688517; bh=1AQyJefjqICQvaUcCxu7U4iQtSFS8/RWRCVpUZQg3HA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0w3AA2JXSleq+JNeadJiEaY7KiUigO1tp8Lgr5QrJ0HiMDpq93lsDRX1AQa0+J4HP 1CDqpWAxCUu7qOkIT7DPFkU11N65gjGEmZuv0VqbHGoK/fS3cRowpdKRvbWdKh8q7+ iSFfCR2QSmnL5NvaPRkjPTItjnzDNWEwVV656gZU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sergei Shtylyov , Wolfram Sang , Simon Horman , Ulf Hansson Subject: [PATCH 4.20 69/88] mmc: tmio_mmc_core: dont claim spurious interrupts Date: Mon, 4 Mar 2019 09:22:52 +0100 Message-Id: <20190304081633.321251160@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190304081630.610632175@linuxfoundation.org> References: <20190304081630.610632175@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sergei Shtylyov commit 5c27ff5db1491a947264d6d4e4cbe43ae6535bae upstream. I have encountered an interrupt storm during the eMMC chip probing (and the chip finally didn't get detected). It turned out that U-Boot left the DMAC interrupts enabled while the Linux driver didn't use those. The SDHI driver's interrupt handler somehow assumes that, even if an SDIO interrupt didn't happen, it should return IRQ_HANDLED. I think that if none of the enabled interrupts happened and got handled, we should return IRQ_NONE -- that way the kernel IRQ code recoginizes a spurious interrupt and masks it off pretty quickly... Fixes: 7729c7a232a9 ("mmc: tmio: Provide separate interrupt handlers") Signed-off-by: Sergei Shtylyov Reviewed-by: Wolfram Sang Tested-by: Wolfram Sang Reviewed-by: Simon Horman Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/host/tmio_mmc_core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -618,7 +618,7 @@ static bool __tmio_mmc_sdcard_irq(struct return false; } -static void __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) +static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) { struct mmc_host *mmc = host->mmc; struct tmio_mmc_data *pdata = host->pdata; @@ -626,7 +626,7 @@ static void __tmio_mmc_sdio_irq(struct t unsigned int sdio_status; if (!(pdata->flags & TMIO_MMC_SDIO_IRQ)) - return; + return false; status = sd_ctrl_read16(host, CTL_SDIO_STATUS); ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask; @@ -639,6 +639,8 @@ static void __tmio_mmc_sdio_irq(struct t if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ) mmc_signal_sdio_irq(mmc); + + return ireg; } irqreturn_t tmio_mmc_irq(int irq, void *devid) @@ -657,9 +659,10 @@ irqreturn_t tmio_mmc_irq(int irq, void * if (__tmio_mmc_sdcard_irq(host, ireg, status)) return IRQ_HANDLED; - __tmio_mmc_sdio_irq(host); + if (__tmio_mmc_sdio_irq(host)) + return IRQ_HANDLED; - return IRQ_HANDLED; + return IRQ_NONE; } EXPORT_SYMBOL_GPL(tmio_mmc_irq);