From patchwork Tue Jun 11 12:32:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 10986825 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6A58A1398 for ; Tue, 11 Jun 2019 12:32:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5BE54285A2 for ; Tue, 11 Jun 2019 12:32:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5029828789; Tue, 11 Jun 2019 12:32:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 39DC0285A2 for ; Tue, 11 Jun 2019 12:32:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388969AbfFKMck (ORCPT ); Tue, 11 Jun 2019 08:32:40 -0400 Received: from mail-lf1-f66.google.com ([209.85.167.66]:44289 "EHLO mail-lf1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388708AbfFKMck (ORCPT ); Tue, 11 Jun 2019 08:32:40 -0400 Received: by mail-lf1-f66.google.com with SMTP id r15so9158972lfm.11 for ; Tue, 11 Jun 2019 05:32:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=HU9V86GjpX1Lj12E8HWKI4k2gg4I+vpQIUImDCvzWsk=; b=Yg8wAqxtQ164zzGBJZ+PSgz4OXKHa+BMpdSLeROa+LthHzMbkjsycGsXdulp1vuBt8 wFcx8V53bpgpwEdomtgsYfi9jG6nCbdKwNPdiipsd59bPELpBhN5Cy6P9pvBuK9QT931 wDKtuzLKIPtSOkC98IQtTSI1/IFFeFq48SB6L/f17m8wYzTTPc6Lhx1e1bYnjV5LviTM dPEZbj0uSf1XRAgY+vERPKPWe4nU/BY4V7cwDpQsIjrdTinPdUg4f3TdmT+CPIBENWLf F6wxj5Uk1QciZygwjIt1FPTVduN/tRKsmvmZ1mjOXEZv8Uf8d//P5iZwwnjGEWMpYt4V ezIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=HU9V86GjpX1Lj12E8HWKI4k2gg4I+vpQIUImDCvzWsk=; b=XTa5GRGtWSdidpnQfLpGQZgxbqqJiKQ8fAQ0mj3NlKWIz4zQaZZSYvwonXqJckfBfY 2mNjmTRaAI7M9klbxLSXArVj9crfCfKAnRLpl4SiMMtOx7QKH/a6u5KYlSPwT6zJkfsy AFB+7Hw/eFSyWisO8rMwYnO+bJpX19VFbmQ19EW3b/a9YFOi1rCZbYeZ51W8JxvDORzg SEevjd9wLxieA/pX04zeUreSSjFtxDiNYeaNwldiJUmtLv1WSg/s7wZ3HG1bNT+fh343 YT4Mfbmc4xnxKWN5YrrP/L1aj9pciRZOAm+uqfQgX1cCUm366HcZsNsfW87ab8zQQZu2 gFjw== X-Gm-Message-State: APjAAAXi7WRoNCUf9M/EYU0gkNsoey4CG/XWd61T6Z5KDMd194eCzdoR mLppiR5CMMzFBpvyMyk4Y2X8VQ== X-Google-Smtp-Source: APXvYqyr2XAwpPPGK8DQ5jtLb+Bh0lIdk3lLxo3JrCyUxs9sNBmrrWH/obZnkRHF9jPP1YigO5UxhA== X-Received: by 2002:ac2:4312:: with SMTP id l18mr32475375lfh.139.1560256358658; Tue, 11 Jun 2019 05:32:38 -0700 (PDT) Received: from uffe-XPS-13-9360.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id m4sm2570653ljc.56.2019.06.11.05.32.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 Jun 2019 05:32:37 -0700 (PDT) From: Ulf Hansson To: linux-mmc@vger.kernel.org, Ulf Hansson , Douglas Anderson Cc: Adrian Hunter , Brian Norris , Shawn Lin , Guenter Roeck , Heiko Stuebner , Kalle Valo , linux-wireless@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] mmc: core: Prevent processing SDIO IRQs when the card is suspended Date: Tue, 11 Jun 2019 14:32:21 +0200 Message-Id: <20190611123221.11580-1-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Processing of SDIO IRQs must obviously be prevented while the card is system suspended, otherwise we may end up trying to communicate with an uninitialized SDIO card. Reports throughout the years shows that this is not only a theoretical problem, but a real issue. So, let's finally fix this problem, by keeping track of the state for the card and bail out before processing the SDIO IRQ, in case the card is suspended. Cc: stable@vger.kernel.org Reported-by: Douglas Anderson Signed-off-by: Ulf Hansson --- This has only been compile tested so far, any help for real test on HW is greatly appreciated. Note that, this is only the initial part of what is needed to make power management of SDIO card more robust, but let's start somewhere and continue to improve things. The next step I am looking at right now, is to make sure the SDIO IRQ is turned off during system suspend, unless it's supported as a system wakeup (and enabled to be used). --- drivers/mmc/core/sdio.c | 7 +++++++ drivers/mmc/core/sdio_irq.c | 4 ++++ 2 files changed, 11 insertions(+) diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index d1aa1c7577bb..9951295d3220 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -937,6 +937,10 @@ static int mmc_sdio_pre_suspend(struct mmc_host *host) */ static int mmc_sdio_suspend(struct mmc_host *host) { + /* Prevent processing of SDIO IRQs in suspended state. */ + mmc_card_set_suspended(host->card); + cancel_delayed_work_sync(&host->sdio_irq_work); + mmc_claim_host(host); if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) @@ -985,6 +989,9 @@ static int mmc_sdio_resume(struct mmc_host *host) err = sdio_enable_4bit_bus(host->card); } + /* Allow SDIO IRQs to be processed again. */ + mmc_card_clr_suspended(host->card); + if (!err && host->sdio_irqs) { if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) wake_up_process(host->sdio_irq_thread); diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c index 931e6226c0b3..9f54a259a1b3 100644 --- a/drivers/mmc/core/sdio_irq.c +++ b/drivers/mmc/core/sdio_irq.c @@ -34,6 +34,10 @@ static int process_sdio_pending_irqs(struct mmc_host *host) unsigned char pending; struct sdio_func *func; + /* Don't process SDIO IRQs if the card is suspended. */ + if (mmc_card_suspended(card)) + return 0; + /* * Optimization, if there is only 1 function interrupt registered * and we know an IRQ was signaled then call irq handler directly.