From patchwork Thu Nov 22 19:52:11 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 10694825 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 05FDF14BD for ; Thu, 22 Nov 2018 20:01:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECE582C84D for ; Thu, 22 Nov 2018 20:01:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DF8E62C42D; Thu, 22 Nov 2018 20:01:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E6D72CE45 for ; Thu, 22 Nov 2018 20:01:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406820AbeKWGdz (ORCPT ); Fri, 23 Nov 2018 01:33:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:32980 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406810AbeKWGdz (ORCPT ); Fri, 23 Nov 2018 01:33:55 -0500 Received: from sasha-vm.mshome.net (unknown [37.142.5.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AFA2B20645; Thu, 22 Nov 2018 19:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542916383; bh=+3rM5jzdyw9D3Z3dXJaI+kXz2N0qo9OEd3GUZ2CRw9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BCW4YfJc7GAGAhflBKW2rsCLFe0jeTUnbA8jzgvKn3Is2Bz67kM3B+XdffP81DDRq n051Qc4TXTVDLQvAWDrMY3gjXx0LpXbByaQwKPmsq0sYqzNw51Srk+7Xsyfa/IxJci c8Twq9EIVvasdYM8vGG04cAaY+RsrduVJJEDha2I= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Arnd Bergmann , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 07/36] scsi: lpfc: fix remoteport access Date: Thu, 22 Nov 2018 14:52:11 -0500 Message-Id: <20181122195240.13123-7-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181122195240.13123-1-sashal@kernel.org> References: <20181122195240.13123-1-sashal@kernel.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Arnd Bergmann [ Upstream commit f8d294324598ec85bea2779512e48c94cbe4d7c6 ] The addition of a spinlock in lpfc_debugfs_nodelist_data() introduced a bug that lets us not skip NULL pointers correctly, as noticed by gcc-8: drivers/scsi/lpfc/lpfc_debugfs.c: In function 'lpfc_debugfs_nodelist_data.constprop': drivers/scsi/lpfc/lpfc_debugfs.c:728:13: error: 'nrport' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (nrport->port_role & FC_PORT_ROLE_NVME_INITIATOR) This changes the logic back to what it was, while keeping the added spinlock. Fixes: 9e210178267b ("scsi: lpfc: Synchronize access to remoteport via rport") Signed-off-by: Arnd Bergmann Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/lpfc/lpfc_debugfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c index aec5b10a8c85..ca6c3982548d 100644 --- a/drivers/scsi/lpfc/lpfc_debugfs.c +++ b/drivers/scsi/lpfc/lpfc_debugfs.c @@ -700,6 +700,8 @@ lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size) rport = lpfc_ndlp_get_nrport(ndlp); if (rport) nrport = rport->remoteport; + else + nrport = NULL; spin_unlock(&phba->hbalock); if (!nrport) continue;