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 28624C43381 for ; Mon, 1 Apr 2019 17:48:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE40C20830 for ; Mon, 1 Apr 2019 17:48:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554140891; bh=lWIPZIahIXGMlmldylMrGQ+SRRWjPowzvzQfxtL9Osk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=n5JEZ8KM2Ao3q2kBiw/T9E4lx0JVAvsFjlpcqPDydWbafO+sL7HPxD95XdzC0jNwL N4Voq7++CmMkkYkIRPY3zL7q+k/19wNv7/Tysnw0hZIzWcMu6QBRO4fN+pOtX69JGD f1zkF416zHQgtnG0EBVxoBvJRvSfeGt4MlqiuB4A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733268AbfDARbg (ORCPT ); Mon, 1 Apr 2019 13:31:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:39084 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732850AbfDARbb (ORCPT ); Mon, 1 Apr 2019 13:31:31 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 76E2E2070B; Mon, 1 Apr 2019 17:31:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554139891; bh=lWIPZIahIXGMlmldylMrGQ+SRRWjPowzvzQfxtL9Osk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K4v67NfAenAKQZ6hlaK0o6+zk7LwbbdI8HhD9loMk0Q9Ljtj7SR/hTe4wX4ZzG6bB 7tz8WoXp52FT8y38it/1MSFYZMeqZyh0IYXgJJACIcsDRfF31+HcTcL5SelEnWUD3x BQYK/BWVCJNBNcpQT+1mtLhNv+Dp8DBAQkeZUIuM= 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 4.4 010/131] mmc: tmio_mmc_core: dont claim spurious interrupts Date: Mon, 1 Apr 2019 19:01:20 +0200 Message-Id: <20190401170052.649350619@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190401170051.645954551@linuxfoundation.org> References: <20190401170051.645954551@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 4.4-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_pio.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -716,7 +716,7 @@ irqreturn_t tmio_mmc_sdio_irq(int irq, v unsigned int sdio_status; if (!(pdata->flags & TMIO_MMC_SDIO_IRQ)) - return IRQ_HANDLED; + return IRQ_NONE; status = sd_ctrl_read16(host, CTL_SDIO_STATUS); ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask; @@ -730,7 +730,7 @@ irqreturn_t tmio_mmc_sdio_irq(int irq, v if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ) mmc_signal_sdio_irq(mmc); - return IRQ_HANDLED; + return IRQ_RETVAL(ireg); } EXPORT_SYMBOL(tmio_mmc_sdio_irq); @@ -747,9 +747,7 @@ irqreturn_t tmio_mmc_irq(int irq, void * if (__tmio_mmc_sdcard_irq(host, ireg, status)) return IRQ_HANDLED; - tmio_mmc_sdio_irq(irq, devid); - - return IRQ_HANDLED; + return tmio_mmc_sdio_irq(irq, devid); } EXPORT_SYMBOL(tmio_mmc_irq);