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=-18.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 F1C4CC48BD1 for ; Wed, 9 Jun 2021 17:05:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB963613D2 for ; Wed, 9 Jun 2021 17:05:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230473AbhFIRG6 (ORCPT ); Wed, 9 Jun 2021 13:06:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:50194 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231303AbhFIRGz (ORCPT ); Wed, 9 Jun 2021 13:06:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 75EA3613D0; Wed, 9 Jun 2021 17:05:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623258300; bh=HwA9vfLqC/L0DDzj6OjBUk165vyATdoHE9IJGyHv7gQ=; h=Subject:To:From:Date:From; b=FHuzGT4LrptPbkPOzaYsGlxqibVc79BQSx4KUusQX3pJvDZEkBNnCTZG1O/d6H567 0JjHIFtOgCB73kXmiuKtptCNqclF1k7T9PXSz9bEcH2RhY0/lv6Y+0MSd2bMhDXD9K W7NuqzDfWnuUsPEcbR8CHzFG8JkN08HQ9EHd/rrc= Subject: patch "bus: mhi: pci-generic: Fix hibernation" added to char-misc-linus To: loic.poulain@linaro.org, gregkh@linuxfoundation.org, manivannan.sadhasivam@linaro.org, stable@vger.kernel.org, wsj20369@163.com From: Date: Wed, 09 Jun 2021 19:04:49 +0200 Message-ID: <16232582891676@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled bus: mhi: pci-generic: Fix hibernation to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From 5f0c2ee1fe8de700dd0d1cdc63e1a7338e2d3a3d Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Sun, 6 Jun 2021 21:07:41 +0530 Subject: bus: mhi: pci-generic: Fix hibernation This patch fixes crash after resuming from hibernation. The issue occurs when mhi stack is builtin and so part of the 'restore-kernel', causing the device to be resumed from 'restored kernel' with a no more valid context (memory mappings etc...) and leading to spurious crashes. This patch fixes the issue by implementing proper freeze/restore callbacks. Link: https://lore.kernel.org/r/1622571445-4505-1-git-send-email-loic.poulain@linaro.org Reported-by: Shujun Wang Cc: stable Reviewed-by: Manivannan Sadhasivam Signed-off-by: Loic Poulain Signed-off-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20210606153741.20725-4-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/bus/mhi/pci_generic.c | 36 ++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index 0a6619ad292c..b3357a8a2fdb 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -935,9 +935,43 @@ static int __maybe_unused mhi_pci_resume(struct device *dev) return ret; } +static int __maybe_unused mhi_pci_freeze(struct device *dev) +{ + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + /* We want to stop all operations, hibernation does not guarantee that + * device will be in the same state as before freezing, especially if + * the intermediate restore kernel reinitializes MHI device with new + * context. + */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + return 0; +} + +static int __maybe_unused mhi_pci_restore(struct device *dev) +{ + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + + /* Reinitialize the device */ + queue_work(system_long_wq, &mhi_pdev->recovery_work); + + return 0; +} + static const struct dev_pm_ops mhi_pci_pm_ops = { SET_RUNTIME_PM_OPS(mhi_pci_runtime_suspend, mhi_pci_runtime_resume, NULL) - SET_SYSTEM_SLEEP_PM_OPS(mhi_pci_suspend, mhi_pci_resume) +#ifdef CONFIG_PM_SLEEP + .suspend = mhi_pci_suspend, + .resume = mhi_pci_resume, + .freeze = mhi_pci_freeze, + .thaw = mhi_pci_restore, + .restore = mhi_pci_restore, +#endif }; static struct pci_driver mhi_pci_driver = { -- 2.32.0