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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 D6398C04AB6 for ; Tue, 28 May 2019 18:31:23 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B1130208CB for ; Tue, 28 May 2019 18:31:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=arista.com header.i=@arista.com header.b="CPcnMefj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B1130208CB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lists.linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id E15202272; Tue, 28 May 2019 18:31:18 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 37517225E for ; Tue, 28 May 2019 18:30:06 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from uscaw2-clmxp01.aristanetworks.com (smtp.aristanetworks.com [54.193.82.35]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 3F6796C5 for ; Tue, 28 May 2019 18:30:03 +0000 (UTC) Received: from uscaw2-clmxp01.aristanetworks.com (localhost [127.0.0.1]) by uscaw2-clmxp01.aristanetworks.com (Postfix) with ESMTP id 3327921459D0; Tue, 28 May 2019 11:30:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=Arista-A; t=1559068202; bh=0YAEwRV8pxaKDZriNp5u14v56Dsy6P+WWcBl+ItO2zQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CPcnMefjLP+bA9kVccxdr6eJyVU7FozZXFEiVVUdiIzZDrWwjiROptZ4c53QaNP5G Sb1uKj3D2NLw1peoM9MgppiBynctpeDgScb+WQhc3y/fumEztSgibXEfIUwTyqBn7q vadn06vPi7Ejxq0lFwj/lYZ/q1QIR6laoVm2vw7B/xDHfqqkRWAxGiJd8DrSysrMk0 nQBUBM9PqX2xihlaVLENurpttKXhXsfeZnhPNoR/CsKURUYTMFDfSLxNlMouCQ0yr+ U4hYjpj22+0prOqjPKRtCE50h3xGtDYFtN2JGJ3IFuQJFBNpqHtc7V2w+ky8YnkxTx XL3jOF/OrHKGA== Received: from chmeee (unknown [10.95.80.198]) by uscaw2-clmxp01.aristanetworks.com (Postfix) with ESMTP id 2ABD13134185; Tue, 28 May 2019 11:30:02 -0700 (PDT) Received: from kevmitch by chmeee with local (Exim 4.92) (envelope-from ) id 1hVgrJ-0000xP-F8; Tue, 28 May 2019 11:30:01 -0700 To: Joerg Roedel Subject: [PATCH 1/3] iommu/amd: make iommu_disable safer Date: Tue, 28 May 2019 11:29:56 -0700 Message-Id: <20190528182958.3623-2-kevmitch@arista.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190528182958.3623-1-kevmitch@arista.com> References: <20190528182958.3623-1-kevmitch@arista.com> MIME-Version: 1.0 Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Kevin Mitchell via iommu Reply-To: Kevin Mitchell Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Make it safe to call iommu_disable during early init error conditions before mmio_base is set, but after the struct amd_iommu has been added to the amd_iommu_list. For example, this happens if firmware fails to fill in mmio_phys in the ACPI table leading to a NULL pointer dereference in iommu_feature_disable. Signed-off-by: Kevin Mitchell --- drivers/iommu/amd_iommu_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index f773792d77fd..3798d7303c99 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -424,6 +424,9 @@ static void iommu_enable(struct amd_iommu *iommu) static void iommu_disable(struct amd_iommu *iommu) { + if (!iommu->mmio_base) + return; + /* Disable command buffer */ iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu