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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45D50C433F5 for ; Wed, 15 Dec 2021 17:47:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=YGEpRV/Ny3Dyu9OCbcUaVn+BNZ2tyKorZXAxBiZ3Dvk=; b=VNUGvTv8bsitG8 LRqu1hyyd8EVQsws3J4HH04pBM/h6NrpJRdGkL+CeX/iz6rxFVmu0fZ+m32UsoOkYCvNVxdikoUf7 6qHshXooBjy/BRqdlzPkDSbcUPNP8sSkkyH7bK9GO4UHrdR9UW2R6346yMvVBL3WJZK7XFKwGwura P91bSan6L761VAOpF32oiXGxeKcIfxkxTgPAIpaTxEEporW2s7qJRtphjnyIx3WzRb7wW2Zav7Mn/ pBFwOwzoGzSG7uPB8fLUEzQs67bqMwVOYVZT2hPAuMkMew1zXR1q+uBVutteyCJdFJPdi95lVeJp0 wuyJp92xJm6w+CXQh8NA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mxYMS-00291G-Sb; Wed, 15 Dec 2021 17:46:41 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mxYMO-0028zn-Mv for linux-arm-kernel@lists.infradead.org; Wed, 15 Dec 2021 17:46:38 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 21FF8618FF; Wed, 15 Dec 2021 17:46:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAC38C36AE0; Wed, 15 Dec 2021 17:46:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1639590395; bh=8eon80aBZeFq23Odf9TNhXLZ0kuufkyxyEQ2UyQvkqg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UkCoNkhqYhaWsFSTKJpb77W8nbK6xBhgXx04HDrtcU3wqKWjQXiGzgyhrmLZyIcpi MQjyZk+Z77/94x42VRHSfHDxYxwbhzyU1x8FRVQnYWLIzTIG39Is2wA6fDhqQ2fpqP n5B4SefG3RtkmGRq+Q9AMgbeRnK4rPW85FgQYoxs= Date: Wed, 15 Dec 2021 18:46:33 +0100 From: Greg Kroah-Hartman To: Thomas Gleixner Cc: LKML , Bjorn Helgaas , Marc Zygnier , Alex Williamson , Kevin Tian , Jason Gunthorpe , Megha Dey , Ashok Raj , linux-pci@vger.kernel.org, Cedric Le Goater , Bjorn Helgaas , Juergen Gross , xen-devel@lists.xenproject.org, Arnd Bergmann , Michael Ellerman , Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, Stuart Yoder , Laurentiu Tudor , Nishanth Menon , Tero Kristo , Santosh Shilimkar , linux-arm-kernel@lists.infradead.org, Vinod Koul , dmaengine@vger.kernel.org, Mark Rutland , Will Deacon , Robin Murphy , Joerg Roedel , iommu@lists.linux-foundation.org, Jassi Brar , Peter Ujfalusi , Sinan Kaya Subject: Re: [patch V4 09-01/35] PCI/MSI: Decouple MSI[-X] disable from pcim_release() Message-ID: References: <20211210221642.869015045@linutronix.de> <20211210221813.740644351@linutronix.de> <87tuf9rdoj.ffs@tglx> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87tuf9rdoj.ffs@tglx> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211215_094636_809436_5E4D9141 X-CRM114-Status: GOOD ( 17.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Dec 15, 2021 at 06:16:44PM +0100, Thomas Gleixner wrote: > The MSI core will introduce runtime allocation of MSI related data. This > data will be devres managed and has to be set up before enabling > PCI/MSI[-X]. This would introduce an ordering issue vs. pcim_release(). > > The setup order is: > > pcim_enable_device() > devres_alloc(pcim_release...); > ... > pci_irq_alloc() > msi_setup_device_data() > devres_alloc(msi_device_data_release, ...) > > and once the device is released these release functions are invoked in the > opposite order: > > msi_device_data_release() > ... > pcim_release() > pci_disable_msi[x]() > > which is obviously wrong, because pci_disable_msi[x]() requires the MSI > data to be available to tear down the MSI[-X] interrupts. > > Remove the MSI[-X] teardown from pcim_release() and add an explicit action > to be installed on the attempt of enabling PCI/MSI[-X]. > > This allows the MSI core data allocation to be ordered correctly in a > subsequent step. > > Reported-by: Nishanth Menon > Signed-off-by: Thomas Gleixner > --- > V4: New patch Reviewed-by: Greg Kroah-Hartman _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel