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Thu, 8 Mar 2018 00:35:52 -0500 Received: from mail-cys01nam02on0093.outbound.protection.outlook.com ([104.47.37.93]:7384 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S935348AbeCHFF6 (ORCPT ); Thu, 8 Mar 2018 00:05:58 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Maor Gottlieb , Leon Romanovsky , Doug Ledford , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 040/101] IB/mlx4: Change vma from shared to private Thread-Topic: [PATCH AUTOSEL for 4.4 040/101] IB/mlx4: Change vma from shared to private Thread-Index: AQHTtpqLON/qbxjXn0+MtPUDfcJ+vA== Date: Thu, 8 Mar 2018 05:01:41 +0000 Message-ID: <20180308050023.8548-40-alexander.levin@microsoft.com> References: <20180308050023.8548-1-alexander.levin@microsoft.com> In-Reply-To: <20180308050023.8548-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1046;7:lqf5kyqpee0jNWnrQSFwQmRKlaTQes0+6/jdksgukGwlKtvfRKZzvKO4ki+9NgBRcmLvi1ZuE5NwIXFTMqIriF2aWtja/eRVj+FKVpz2dnJ8K+eN73kdYWhYiDMZX/s0nA/x/ltNLsfd4Nl3zZeWh+Yajj0KF8VRWluEUwZVwuEIV/SSBUPUv36FDC/y0BPUrtgzZF1u65zGIJCIRXxOiaVDJ7LpLpFPHRQxD84rV1JWizZkGBHDC+GwHQj1Ukvt;20:9eHKpGeXGjN99QvqzdcL7pXRxDyMrSP3gCOERJdrfR5OjNS8Ln3VKo8eXy3IHWn7I23yPJEmvzK5MK9uMPofxNZrtiYSlUHOBYV25bI2Ob/XVzRjYTklvBWaKDthw6p1J+6JrV8O2wId3Ek3IjgKNiCFQAnuqwmfTBH290fglxE= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: aa6a3e87-c034-47b0-e3d6-08d584b2440d x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1046; 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x-microsoft-antispam-message-info: 577i7AvC9HemlHR9uBl9X3763dyNFmqJuG8Nbiat9ympR0BtXI3f3Vn+8H64oghkOTb0ldzA2bKzQ0aBgWeQmY+fVctGAQwV3TxAR6c4aZssvrhPzG4/dFkrgveYMDGBjqx6UubvtOMKVz2X4CaJ8nfOjW8cGZTpOLGYFE+OojPt9hFa8x2Lkr9zvkjiNn0nRa5R3pXADGzZKhpEvacGdMb1NI17KzGknD5QEH+KMmH0HJ++3F8WiC6VOHRMTtZKUadDWFS9D6cF8JUSup327PSCYpJY6lhKMZUSHUR15szU/ZlJSbRPzH+GekWytPPbOc8eNHLAE3mzI34G/RcUyQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: aa6a3e87-c034-47b0-e3d6-08d584b2440d X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 05:01:41.3901 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1046 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Maor Gottlieb [ Upstream commit ca37a664a8e4e9988b220988ceb4d79e3316f195 ] Anonymous VMA (->vm_ops =3D=3D NULL) cannot be shared, otherwise it would lead to SIGBUS. Remove the shared flags from the vma after we change it to be anonymous. This is easily reproduced by doing modprobe -r while running a user-space application such as raw_ethernet_bw. Fixes: ae184ddeca5db ('IB/mlx4_ib: Disassociate support') Signed-off-by: Maor Gottlieb Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford Signed-off-by: Sasha Levin --- drivers/infiniband/hw/mlx4/main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4= /main.c index 9119e0b3c2b8..67c4c73343d4 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1055,6 +1055,8 @@ static void mlx4_ib_disassociate_ucontext(struct ib_u= context *ibcontext) BUG_ON(1); } =20 + context->hw_bar_info[i].vma->vm_flags &=3D + ~(VM_SHARED | VM_MAYSHARE); /* context going to be destroyed, should not access ops any more */ context->hw_bar_info[i].vma->vm_ops =3D NULL; } --=20 2.14.1