From patchwork Fri Feb 9 23:52:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Harris X-Patchwork-Id: 199159 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:50ea:b0:106:860b:bbdd with SMTP id r10csp1200967dyd; Fri, 9 Feb 2024 15:52:45 -0800 (PST) X-Google-Smtp-Source: AGHT+IHn87WcKGNjcLdUap6ND3H14LcLDD8GLKz8QwdqgKG4LKkOCfaOVr/2UyEtDuYSN5prYpgl X-Received: by 2002:a05:6870:4d01:b0:219:fdbb:bd4d with SMTP id pn1-20020a0568704d0100b00219fdbbbd4dmr906676oab.10.1707522765529; Fri, 09 Feb 2024 15:52:45 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707522765; cv=pass; d=google.com; s=arc-20160816; b=TfUJLg1g/cEE8hgOnauxVcINaOGFyDbXfhTAMpf1nWW4Y9Wk8CgEWABirXsC7NwldM 4Y6sk8LhyJdvDdffsj4ymQl0q6hkkGPZkQuZp4IsspdZUUghfAVOtyAcXyvGYJqeKX3g OYc+DFEymqFJ+Fj9oRYzAeJTj+NnqoRf1hyoADADGbU94fwtKJi4UN1GbyrsvaT0z/TD dw50nn+zOiYKv25Q06lPHINUpF/m49NF2ya9nG67Whbt2CdozDb0F1tCbTKxGNlLw8nK 96RCmpjt0M7CEpkgYp0yK9r3nj8+dEtvfYjUQs4yuHZxjQiHXUc3Dbk5uRQ/wmqyqOKH 4kCw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:cms-type:mime-version:list-unsubscribe:list-subscribe :list-id:precedence:content-transfer-encoding:content-id :content-language:accept-language:in-reply-to:message-id:date :thread-index:thread-topic:subject:to:from:dkim-signature :dkim-filter; bh=NWHjQPlaGIQ9OtliJHmGY1JMnvToGgMO8MA8ryL6e5g=; fh=NzlMcLPPH0zx9RKbeZxfKKeG7n5nkaPilS0a+kzasdE=; b=ChJscN+vrfLDc2dtj24E7Hmbng5e2QOtCrIOadJHCCGeubryTPWyizvFG+4kbOCx4R ZCAeuvLxAMYfjjgJEuZtHaGFty1s7qQfnvV+dWpj9RzbMcimfyqJ1jYwlYM1cp3WA07+ e+x9BBmQkGolCVGMF2P8LTH6qO0+xjhr/4ROz/1T4RLhmtaojQqRtEKM30hRhrLaMZ2X 5JsoAf2KU1u5TuZBjT04yZ1Rc2957JZrcJxWLOQ0VNHouMYzFFHlU0GIK0+8ES+6V2PE yhfdIO72sJThyYLShYfrKF6hnANvAENyH9Ifg/uPMvrLfeOTHGL+H0uopqenHvS5Sa1E 6TNA==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=LusQBJ16; arc=pass (i=1 spf=pass spfdomain=samsung.com dkim=pass dkdomain=samsung.com dmarc=pass fromdomain=samsung.com); spf=pass (google.com: domain of linux-kernel+bounces-60157-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60157-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com X-Forwarded-Encrypted: i=2; AJvYcCXbb5pgh22H9XZbVC8bmTT6YsGYoGYG+SIJZW5VWVJ8EruwUGXeM/5dVPX1kuJ2p+quWhygMLDef1/YPKzZNSGxuCcLvg== Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id b27-20020a63715b000000b005897813624fsi2546288pgn.476.2024.02.09.15.52.45 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Feb 2024 15:52:45 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-60157-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=LusQBJ16; arc=pass (i=1 spf=pass spfdomain=samsung.com dkim=pass dkdomain=samsung.com dmarc=pass fromdomain=samsung.com); spf=pass (google.com: domain of linux-kernel+bounces-60157-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60157-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 4A16E28C288 for ; Fri, 9 Feb 2024 23:52:45 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C247738DF8; Fri, 9 Feb 2024 23:52:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="LusQBJ16" Received: from mailout2.w2.samsung.com (mailout2.w2.samsung.com [211.189.100.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C71538FB9; Fri, 9 Feb 2024 23:52:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.189.100.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707522738; cv=none; b=CIe4jl7yvndKnDwiIo1p+tgNqbwY/9FlSbJw35lS3fc4cMwcl+YqbGS4fanvoelox73mlhnk/qgf9a41cONa4j/EA1Ep6LUOFGOUHWUp8Yd9q6gUQMzdFGfy1afwD1FsXP1GlHstoQoPWYHTeGolamTauUcpOVK2jEGr3B87JOA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707522738; c=relaxed/simple; bh=NWHjQPlaGIQ9OtliJHmGY1JMnvToGgMO8MA8ryL6e5g=; h=From:To:Subject:Date:Message-ID:In-Reply-To:Content-Type: MIME-Version:References; b=ZLVeItb58A219DQmxjOGVLQ8j2C6XD+FfF+pTH7lQ30EylsNhwSZcdUlQ2XBYN2AoumnsEvZ/J+pMNSZuDoTPm+9WGv3VTVIpcj5xmT4d98mp+t9qoLS1Mr0/9aYzSZKUWC8gGtd5ml+gKUL7wSZb3gnDHgEjQH/b8mbbji5krI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=LusQBJ16; arc=none smtp.client-ip=211.189.100.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Received: from uscas1p2.samsung.com (unknown [182.198.245.207]) by mailout2.w2.samsung.com (KnoxPortal) with ESMTP id 20240209235214usoutp0211a981d2cc3704b6e04b6afb426759d7~yVuFVnazW0735807358usoutp02P; Fri, 9 Feb 2024 23:52:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w2.samsung.com 20240209235214usoutp0211a981d2cc3704b6e04b6afb426759d7~yVuFVnazW0735807358usoutp02P DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1707522734; bh=NWHjQPlaGIQ9OtliJHmGY1JMnvToGgMO8MA8ryL6e5g=; h=From:To:Subject:Date:In-Reply-To:References:From; b=LusQBJ16MTV4T+mTwWDCGSexl6lXIN7AQppjKIB6Hmy5/0FLZGqWv6b0NgZolkSY+ lZjvi1QT4Zeu5qbVMrKyVDAVxkcC3SOiamThh6szztPK/pY394hFkyV76E1lFF4+28 /ODqlv7WejgD+GiUpDNN7bOSDLV4z7vwI3qWRNOM= Received: from ussmges1new.samsung.com (u109.gpu85.samsung.co.kr [203.254.195.109]) by uscas1p1.samsung.com (KnoxPortal) with ESMTP id 20240209235213uscas1p1405627f096500d89d28cc2b46806a5fd~yVuEi2rxO2023420234uscas1p1P; Fri, 9 Feb 2024 23:52:13 +0000 (GMT) Received: from uscas1p1.samsung.com ( [182.198.245.206]) by ussmges1new.samsung.com (USCPEMTA) with SMTP id 73.51.09678.DAAB6C56; Fri, 9 Feb 2024 18:52:13 -0500 (EST) Received: from ussmgxs1new.samsung.com (u89.gpu85.samsung.co.kr [203.254.195.89]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240209235213uscas1p2e8de2bdf05e6e7cba51bd41ddb42a8e4~yVuEO-23j3138731387uscas1p2s; Fri, 9 Feb 2024 23:52:13 +0000 (GMT) X-AuditID: cbfec36d-85fff700000025ce-c6-65c6baadf240 Received: from SSI-EX2.ssi.samsung.com ( [105.128.3.67]) by ussmgxs1new.samsung.com (USCPEXMTA) with SMTP id A1.0B.50167.DAAB6C56; Fri, 9 Feb 2024 18:52:13 -0500 (EST) Received: from SSI-EX2.ssi.samsung.com (105.128.2.227) by SSI-EX2.ssi.samsung.com (105.128.2.227) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.2375.24; Fri, 9 Feb 2024 15:52:12 -0800 Received: from SSI-EX2.ssi.samsung.com ([105.128.2.227]) by SSI-EX2.ssi.samsung.com ([105.128.2.227]) with mapi id 15.01.2375.024; Fri, 9 Feb 2024 15:52:12 -0800 From: Jim Harris To: Bjorn Helgaas , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Leon Romanovsky , "Jason Gunthorpe" , Alex Williamson , "pierre.cregut@orange.com" Subject: [PATCH v2 1/2] PCI/IOV: Revert "PCI/IOV: Serialize sysfs sriov_numvfs reads vs writes" Thread-Topic: [PATCH v2 1/2] PCI/IOV: Revert "PCI/IOV: Serialize sysfs sriov_numvfs reads vs writes" Thread-Index: AQHaW7MAtwi2xwjfZkaUZDAOVEJQAw== Date: Fri, 9 Feb 2024 23:52:12 +0000 Message-ID: <170752273224.1693615.11371097645648272257.stgit@bgt-140510-bm01.eng.stellus.in> In-Reply-To: <170752254154.1693615.9176696143128338408.stgit@bgt-140510-bm01.eng.stellus.in> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-ID: <89791AD5EB1C934187241FFFDADB64F6@ssi.samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrGKsWRmVeSWpSXmKPExsWy7djXc7prdx1LNfg6Wdni2/8eNoslTRkW V/7tYbTYtOEJi8XlXXPYLM7OO85msf7rezYHdo8Fm0o9epvfsXm0PDvJ5vF+31U2j8+b5AJY o7hsUlJzMstSi/TtErgymmbsYSnYJlBxe3EDewNjg0AXIyeHhICJxMSnRxlBbCGBlYwSC3qU IexWJomLr4Ngal427GPtYuQCiq9hlNh9YxorRNFHRol/5+0gEksZJSb397KDJNgENCV+XVnD BJIQEbjKJDF59QdmkISwQKLEjeb3LCC2iECaxLXTlxghbD2JR/+fgtksAioS/26uAavnFYiR 2PPxLROIzQlkv+vbBBZnFBCT+H5qDVicWUBc4taT+UwQpwpKLJq9hxnCFpP4t+shG4StKHH/ +0ug4ziA6jUl1u/Sh2i1k3gxdx8bhK0oMaX7ITvEWkGJkzOfsEC0SkocXHGDBeQXCYEzHBLT Xn5mhUi4SLw8vYcdwpaWuHp9KtTebImV6zuYQHZJCBRINByBhqK1xMI/66FO5pP4++sR4wRG 5VlIPpiFcN0sJNfNQnLdLCTXLWBkXcUoXlpcnJueWmyYl1quV5yYW1yal66XnJ+7iRGYlE7/ O5y7g3HHrY96hxiZOBgPMUpwMCuJ8IYsOZIqxJuSWFmVWpQfX1Sak1p8iFGag0VJnNfQ9mSy kEB6YklqdmpqQWoRTJaJg1OqgclJ++PdVTMvKqUGN+qcm60vt7316E/914bbYzbu3/T/N4fb kzcKmskGc+tKm5PutIifbHcrnGcg9MDJVeZ0w6Sp500kxEKzVsxQmPgrzHd6UuubvZOOrp2U Ktz/Sr+i/+LbxRV3WGtXS60qk5olfOrn+u9vM7vX1oqsqjx4etYUFS0Fq5nv7V+kbr/8QtTn 4nGJ5WU5f8SP7f7eucHm1fuV7C5nP7mXCcp8PngvzIT7XRb/tsY5tnZvDDtuRC8X0bql8m/e xxPTuOflvlL9edZ7ocyczmfH4m5uXj35b+B34TvzElacfih4mKPw1SenIzXft13T5F3TvK9k 5g7R4rp/z9XkVqb8Pldlf09w1eMEOyWW4oxEQy3mouJEANMPk6i5AwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrNIsWRmVeSWpSXmKPExsWS2cDsrLt217FUg2e7eS2+/e9hs1jSlGFx 5d8eRotNG56wWFzeNYfN4uy842wW67++Z3Ng91iwqdSjt/kdm0fLs5NsHu/3XWXz+LxJLoA1 issmJTUnsyy1SN8ugSujacYeloJtAhW3FzewNzA2CHQxcnJICJhIvGzYx9rFyMUhJLCKUWLF lbUsEM5HRoklS5dAZZYySiw8+4kNpIVNQFPi15U1TCAJEYGrTBKTV39gBkkICyRKXL08jxHE FhFIk7h2+hKUrSfx6P9TMJtFQEXi3801YPW8AjESez6+ZQKxhQSiJeZPnMwOYnMCxd/1bQKr YRQQk/h+ag1YDbOAuMStJ/OZIO4WkFiy5zwzhC0q8fLxP1YIW1Hi/veXQHM4gOo1Jdbv0odo tZN4MXcfG4StKDGl+yE7xAmCEidnPmGBaJWUOLjiBssERvFZSLbNQpg0C8mkWUgmzUIyaQEj 6ypG8dLi4tz0imLDvNRyveLE3OLSvHS95PzcTYzA+D3973DkDsajtz7qHWJk4mA8xCjBwawk whuy5EiqEG9KYmVValF+fFFpTmrxIUZpDhYlcd67DzRShQTSE0tSs1NTC1KLYLJMHJxSDUwh Bi/tDFxrHTed+iEn92TBBPt+U2WORczPtqw6+P3f4yCjHetUgiSvzLz38cHu1J7lvUveCPb8 XbpWft7iWQElPFEPWQPrFv6YdrfRsejP1Dm3801N/I0cylOrW1Nl3f6lLK2YZnLkyeKQtO/b FpnuCwqst04uVTr76oH1kkO/7V/HRcmo+dlGum27lbDtZ1ce7web8xtjSs7t3nVg3b1nRs9f XU+WbXNssit4pPBtr+/sUC6NzI8pSfpqkzZeWnl3xg/TuaZOru3d4dnlsZwXF9TXSZyJTfnf NLEi+/gsj5N7L9/rWvm0+/JL371hVq0pLVvvGO6slT/oKiwhstZtz7E9308ayq+4nBNsJ1Ko xFKckWioxVxUnAgAc2HpCE4DAAA= X-CMS-MailID: 20240209235213uscas1p2e8de2bdf05e6e7cba51bd41ddb42a8e4 CMS-TYPE: 301P X-CMS-RootMailID: 20240209235213uscas1p2e8de2bdf05e6e7cba51bd41ddb42a8e4 References: <170752254154.1693615.9176696143128338408.stgit@bgt-140510-bm01.eng.stellus.in> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790467391480335679 X-GMAIL-MSGID: 1790467391480335679 If an SR-IOV enabled device is held by vfio, and the device is removed, vfio will hold device lock and notify userspace of the removal. If userspace reads the sriov_numvfs sysfs entry, that thread will be blocked since sriov_numvfs_show() also tries to acquire the device lock. If that same thread is responsible for releasing the device to vfio, it results in a deadlock. The proper way to detect a change to the num_VFs value is to listen for a sysfs event, not to add a device_lock() on the attribute _show() in the kernel. This reverts commit 35ff867b76576e32f34c698ccd11343f7d616204. Revert had a small conflict, the sprintf() is now changed to sysfs_emit(). Link: https://lore.kernel.org/linux-pci/ZXJI5+f8bUelVXqu@ubuntu/ Suggested-by: Leon Romanovsky Reviewed-by: Leon Romanovsky Signed-off-by: Jim Harris --- drivers/pci/iov.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index aaa33e8dc4c9..0ca20cd518d5 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -395,14 +395,8 @@ static ssize_t sriov_numvfs_show(struct device *dev, char *buf) { struct pci_dev *pdev = to_pci_dev(dev); - u16 num_vfs; - - /* Serialize vs sriov_numvfs_store() so readers see valid num_VFs */ - device_lock(&pdev->dev); - num_vfs = pdev->sriov->num_VFs; - device_unlock(&pdev->dev); - return sysfs_emit(buf, "%u\n", num_vfs); + return sysfs_emit(buf, "%u\n", pdev->sriov->num_VFs); } /* From patchwork Fri Feb 9 23:52:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Harris X-Patchwork-Id: 199160 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:50ea:b0:106:860b:bbdd with SMTP id r10csp1201052dyd; Fri, 9 Feb 2024 15:53:01 -0800 (PST) X-Google-Smtp-Source: AGHT+IG5EbhqxWFMb9cnUdF+a30uhKk887IuO7t4LFAT52UEztrL51yej9OBSozqzbE1qCjz/uFh X-Received: by 2002:a17:903:246:b0:1d9:8d17:87b8 with SMTP id j6-20020a170903024600b001d98d1787b8mr1031831plh.34.1707522781196; Fri, 09 Feb 2024 15:53:01 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707522781; cv=pass; d=google.com; s=arc-20160816; b=wQft/rc+ZCjGS0UrYTvd0nfKUkQUOggHJ5fNP8s8Lj+TJpV4gXo5Tut9suVMpcA5yQ jMkeQmomT30nSP/ZgA63ymWCi5IaNHNbPtQsrTJ4cggrSzxwdOJN22w3BaAOe/z4YSs8 Pnrpcl1yFFAVASzcB6UMOui94a21PVbwwE+C0Wa6ZkXTftydcpgvQiLe5WssBSCcU0l1 2bAlL1UfBKD0sUJjS20ZpO4W9pTLETtL373vDdenJaYyPf2gIspkUQPKZmeO3WExcklY rB7my+SbE1o+LAxsmbdvMjH0DuiiX/iOZ1n8itSEu5tWde2gMxhvJVEyqEcUVSBWF5BA dA/A== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:cms-type:mime-version:list-unsubscribe:list-subscribe :list-id:precedence:content-transfer-encoding:content-id :content-language:accept-language:in-reply-to:message-id:date :thread-index:thread-topic:subject:to:from:dkim-signature :dkim-filter; bh=WLrHOuX9LdrO7L5O1dP72CK5rXJ4snnRsQhv9u8vEK0=; fh=fyri73RBCF53KyFk4sAApAt4LIqmWclugV40Z6Mg9M8=; b=riSRYH7fcrkg8Wo5DTu3wF5jk+UVqi9ALJzFwbrojafN6WKf55k0Mb+0rlsA6MoeBX 5PTMFXFGdHr727M6hFBE1o8iQ7X2qaV9tOPzyYnbOji457MuDrIEHPXEjwYv8sKhkp01 7r1rCBJz69zS614ESkbi0RsH/yiAcKD+jarOJ2QBBBcTRdgbqoM82bXOE1KdIGdp3QFX 6uy4uXVQJDEWsRekD4wzqJ/fZVRrx3J6fLSoHeGCm9JEDwmawec9E1sw7WsMlH+Zm1H2 0XUsvbzWKNz8b7nrOKMDwt3TyspbMHh+H3QSThegWd2ruXv2QInPe97+9CU0jxUmvA+n 8aYg==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=mN14RZDL; arc=pass (i=1 spf=pass spfdomain=samsung.com dkim=pass dkdomain=samsung.com dmarc=pass fromdomain=samsung.com); spf=pass (google.com: domain of linux-kernel+bounces-60158-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60158-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com X-Forwarded-Encrypted: i=2; AJvYcCUd5plBAALndkZ/7X9krVt3TpCEIvmdxL6q524cQ3yI1k2VScZfGEfXNNycP6w42Aec1SmQOaYxldIL9rSZN3nxSpS5aQ== Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id j1-20020a170902da8100b001d97804deb2si2574039plx.459.2024.02.09.15.53.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Feb 2024 15:53:01 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-60158-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=mN14RZDL; arc=pass (i=1 spf=pass spfdomain=samsung.com dkim=pass dkdomain=samsung.com dmarc=pass fromdomain=samsung.com); spf=pass (google.com: domain of linux-kernel+bounces-60158-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60158-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id EE61728C3A9 for ; Fri, 9 Feb 2024 23:53:00 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id EDB3039FCD; Fri, 9 Feb 2024 23:52:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="mN14RZDL" Received: from mailout1.w2.samsung.com (mailout1.w2.samsung.com [211.189.100.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 044F538399; Fri, 9 Feb 2024 23:52:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.189.100.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707522742; cv=none; b=qYsCvZntC1Xb7vqZKhUV+JOxWaV5hJaRStZg8SEt2zz4FSd7M9LwhEw33rb5BPOaGnGNCpsnUcsd/RcC1SEVhiveVT0fpb0zaFwd/YrsnSPAycNwRoNccsGoPsnH+j1RUPtowuQF+reFH+ITuh5BpA4qQU2n3EUdjTOrVzqcw40= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707522742; c=relaxed/simple; bh=WLrHOuX9LdrO7L5O1dP72CK5rXJ4snnRsQhv9u8vEK0=; h=From:To:Subject:Date:Message-ID:In-Reply-To:Content-Type: MIME-Version:References; b=DIMALQU1CgVjvKMuPZ9zJqZhQREBbzrjNPmTa7EprKTHXNkjG0VGksDiWJSFHMzQPpAeEt44g8I4owtygi5LqwS8YxKRW97xa27UovHbvpaVyIFgrmV0ikNozk2wcC6H7WlTI7OEZtw3w5MiPcycvnxvI01SpMPpNZtAjlQZemY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=mN14RZDL; arc=none smtp.client-ip=211.189.100.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Received: from uscas1p2.samsung.com (unknown [182.198.245.207]) by mailout1.w2.samsung.com (KnoxPortal) with ESMTP id 20240209235219usoutp0184de282892a811f8b9d7e9d2b15b3cbc~yVuJldZpG0135901359usoutp01F; Fri, 9 Feb 2024 23:52:19 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w2.samsung.com 20240209235219usoutp0184de282892a811f8b9d7e9d2b15b3cbc~yVuJldZpG0135901359usoutp01F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1707522739; bh=WLrHOuX9LdrO7L5O1dP72CK5rXJ4snnRsQhv9u8vEK0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=mN14RZDLHqp2SNMowOLAWAowlYnXEl0FcmsVph8ugmoaXOMn6CbUhuxAYJj6U6414 SQzYMDTl7M+Ye444r5OHYP57uZX/BoBVIM552DA2HODRWR6QB0BXzSlLY9gORN0PrK e9rVv5Yr3AToaUlZtM4QadfA9Eoe/V9fJHgGCMKw= Received: from ussmges1new.samsung.com (u109.gpu85.samsung.co.kr [203.254.195.109]) by uscas1p1.samsung.com (KnoxPortal) with ESMTP id 20240209235218uscas1p122a48f65d0cbd18350608763c21ef317~yVuJfB9Ov2264622646uscas1p1O; Fri, 9 Feb 2024 23:52:18 +0000 (GMT) Received: from uscas1p2.samsung.com ( [182.198.245.207]) by ussmges1new.samsung.com (USCPEMTA) with SMTP id 55.51.09678.2BAB6C56; Fri, 9 Feb 2024 18:52:18 -0500 (EST) Received: from ussmgxs3new.samsung.com (u92.gpu85.samsung.co.kr [203.254.195.92]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240209235218uscas1p2d0978af6623037fa1b9358a2ad2320c5~yVuJLHlSF3138731387uscas1p2u; Fri, 9 Feb 2024 23:52:18 +0000 (GMT) X-AuditID: cbfec36d-acdff700000025ce-cf-65c6bab23583 Received: from SSI-EX2.ssi.samsung.com ( [105.128.3.66]) by ussmgxs3new.samsung.com (USCPEXMTA) with SMTP id 97.EB.50948.2BAB6C56; Fri, 9 Feb 2024 18:52:18 -0500 (EST) Received: from SSI-EX2.ssi.samsung.com (105.128.2.227) by SSI-EX2.ssi.samsung.com (105.128.2.227) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.2375.24; Fri, 9 Feb 2024 15:52:17 -0800 Received: from SSI-EX2.ssi.samsung.com ([105.128.2.227]) by SSI-EX2.ssi.samsung.com ([105.128.2.227]) with mapi id 15.01.2375.024; Fri, 9 Feb 2024 15:52:17 -0800 From: Jim Harris To: Bjorn Helgaas , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Leon Romanovsky , "Jason Gunthorpe" , Alex Williamson , "pierre.cregut@orange.com" Subject: [PATCH v2 2/2] pci/iov: fix kobject_uevent() ordering in sriov_enable() Thread-Topic: [PATCH v2 2/2] pci/iov: fix kobject_uevent() ordering in sriov_enable() Thread-Index: AQHaW7MDr2cp3vZCgUeCreKO+yDYPA== Date: Fri, 9 Feb 2024 23:52:17 +0000 Message-ID: <170752273749.1693615.1293677023514112939.stgit@bgt-140510-bm01.eng.stellus.in> In-Reply-To: <170752254154.1693615.9176696143128338408.stgit@bgt-140510-bm01.eng.stellus.in> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-ID: <2400EE9658E5F547852121863CD747C6@ssi.samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrJKsWRmVeSWpSXmKPExsWy7djX87qbdh1LNfi8zsTi2/8eNoslTRkW V/7tYbTYtOEJi8XlXXPYLM7OO85msf7rezYHdo8Fm0o9epvfsXm0PDvJ5vF+31U2j8+b5AJY o7hsUlJzMstSi/TtErgyVj/6wFiwhbPixPnNrA2MUzi7GDk5JARMJC7fnsvexcjFISSwklGi Y9FSKKeVSaLr8kwWmKpfPyewQSTWMEqsXfWTFcL5yCgx/90LqMxSRolNf5+wgrSwCWhK/Lqy hgkkISJwlUli8uoPzCAJYYEgiQdPXzGC2CIC4RIH3jexQdh6Eidm3GYCsVkEVCS+fnwLVsMr EC2xe+c5sDinQIzEu75NYHMYBcQkvp9aAxZnFhCXuPVkPhPErYISi2bvYYawxST+7XrIBmEr Stz//hLoOQ6gek2J9bv0IVrtJDb1TWSDsBUlpnQ/ZIdYKyhxcuYTqPclJQ6uuMEC8ouEwBkO ibvvZkDtcpHYf/8M1C5pielrLkM1ZEusXN/BBLJLQqBAouFIEETYWmLhn/VQJ/NJ/P31iHEC o/IsJB/MQrhuFpLrZiG5bhaS6xYwsq5iFC8tLs5NTy02zEst1ytOzC0uzUvXS87P3cQITE2n /x3O3cG449ZHvUOMTByMhxglOJiVRHhDlhxJFeJNSaysSi3Kjy8qzUktPsQozcGiJM5raHsy WUggPbEkNTs1tSC1CCbLxMEp1cC0UOzw/p0LjoR4dp9LOpM7b8NG9p1ekd8DAzcozuw04pxm 6Ms3eVVg1+mroQFKV69od/+e051UyTXbZM4bz/sFsi7c9ey/1q3LynzcueGydsrPIoV7LTv2 cnw/EibstXfBJUmTl4lOHIbNTK65LOXr+1z6L126bJmdtd7g1o99xjud/81RXPWUR9NHS/CD rTBva/jdQ7J/4ms+Ol3o/9324kvHU/bIyuU+c10PeqRyOnJcbAxOeL+oKcc5dolyndTcK8YR L5yUyjoeSz+ZU7dBjonZjPH0boXbK3Xr2tZebD+e0ynLnfgk0On809yOS4ee3+S7LSo13SlP JdeY4cGqG56S6/TYUjcmfJr43lKJpTgj0VCLuag4EQABwtNZvAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrNIsWRmVeSWpSXmKPExsWS2cDspLtp17FUg44HShbf/vewWSxpyrC4 8m8Po8WmDU9YLC7vmsNmcXbecTaL9V/fszmweyzYVOrR2/yOzaPl2Uk2j/f7rrJ5fN4kF8Aa xWWTkpqTWZZapG+XwJWx+tEHxoItnBUnzm9mbWCcwtnFyMkhIWAi8evnBLYuRi4OIYFVjBJN /z4wQzgfGSXedj5jh3CWMkp8uXyCEaSFTUBT4teVNUwgCRGBq0wSk1eDtHByCAsESTx4+gqs SEQgXGLP4oPsELaexIkZt5lAbBYBFYmvH9+C1fAKREvs3nkOLC4EZM+fOBmsnlMgRuJd3yaw mYwCYhLfT60Bq2EWEJe49WQ+E8TdAhJL9pxnhrBFJV4+/scKYStK3P/+EmgOB1C9psT6XfoQ rXYSm/omskHYihJTuh+yQ5wgKHFy5hMWiFZJiYMrbrBMYBSfhWTbLIRJs5BMmoVk0iwkkxYw sq5iFC8tLs5Nryg2zkst1ytOzC0uzUvXS87P3cQIjN/T/w7H7GC8d+uj3iFGJg7GQ4wSHMxK IrwhS46kCvGmJFZWpRblxxeV5qQWH2KU5mBREue9+0AjVUggPbEkNTs1tSC1CCbLxMEp1cBU 6HT4YFyPMENx7U2bpwK//ucua9nLZ5T8eFnxkc49rrPterL2B+/O/33T9cq2UKHZE1gf5nWy W5+d8tdLJODpgz1y7kssmSwsNsvsOmWwNYxt3TTmSbOXzi4/5ZywIcP7l4VY0MW2GfW3DofW 5/3J/Prb0GTeDXWr69wGTNxMO/6KVqyKX3T69oTdD6Tv3fwuWvJ7erVCpTl785TErt2tvgWs 995yXpHd4LX3gYvLnnovy5RrXhmm5x374kSePftvyew5X+Xq9PvXAlTXTmlvEeu19PVf2tJ6 vkzwwMavCZVbynWTYpn+rehh4e1XW2rfLrBW8lur/vm/Ln7rl37NUdpzPmf7lOA1Xxtvuj5T YinOSDTUYi4qTgQAO5jdO04DAAA= X-CMS-MailID: 20240209235218uscas1p2d0978af6623037fa1b9358a2ad2320c5 CMS-TYPE: 301P X-CMS-RootMailID: 20240209235218uscas1p2d0978af6623037fa1b9358a2ad2320c5 References: <170752254154.1693615.9176696143128338408.stgit@bgt-140510-bm01.eng.stellus.in> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790467407461584189 X-GMAIL-MSGID: 1790467407461584189 Wait to call kobject_uevent() until all of the associated changes are done, including updating the num_VFs value. This avoids any possibility of userspace responding to the event and getting a stale value (although probably impossible to actually happen). Suggested-by: Leon Romanovsky Reviewed-by: Leon Romanovsky Signed-off-by: Jim Harris Reviewed-by: Kuppuswamy Sathyanarayanan --- drivers/pci/iov.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 0ca20cd518d5..c00b0f822526 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -677,8 +677,8 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) if (rc) goto err_pcibios; - kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); iov->num_VFs = nr_virtfn; + kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); return 0;