From patchwork Tue Apr 15 09:37:14 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Gordeev X-Patchwork-Id: 3990561 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 175F3BFF02 for ; Tue, 15 Apr 2014 09:35:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 39E4B20221 for ; Tue, 15 Apr 2014 09:35:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFD5420166 for ; Tue, 15 Apr 2014 09:35:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750990AbaDOJfi (ORCPT ); Tue, 15 Apr 2014 05:35:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39733 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750866AbaDOJfh (ORCPT ); Tue, 15 Apr 2014 05:35:37 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s3F9ZZfw024911 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 15 Apr 2014 05:35:36 -0400 Received: from dhcp-26-207.brq.redhat.com (dhcp-26-119.brq.redhat.com [10.34.26.119]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s3F9ZXY2006799; Tue, 15 Apr 2014 05:35:34 -0400 From: Alexander Gordeev To: linux-kernel@vger.kernel.org Cc: Alexander Gordeev , Shahed Shaikh , Dept-HSGLinuxNICDev@qlogic.com, netdev@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH] qlcnic: Fix MSI-X initialization code Date: Tue, 15 Apr 2014 11:37:14 +0200 Message-Id: <1397554634-26795-1-git-send-email-agordeev@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Function qlcnic_setup_tss_rss_intr() might enter endless loop in case pci_enable_msix() contiguously returns a positive number of MSI-Xs that could have been allocated. Besides, the function contains 'err = -EIO;' assignment that never could be reached. This update fixes the aforementioned issues. Cc: Shahed Shaikh Cc: Dept-HSGLinuxNICDev@qlogic.com Cc: netdev@vger.kernel.org Cc: linux-pci@vger.kernel.org Signed-off-by: Alexander Gordeev Acked-by: Shahed Shaikh --- drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c | 28 ++++++++++++--------- 1 files changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c index 309d056..2e615d5 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c @@ -670,7 +670,7 @@ int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter *adapter) else num_msix += adapter->drv_tx_rings; - if (adapter->drv_rss_rings > 0) + if (adapter->drv_rss_rings > 0) num_msix += adapter->drv_rss_rings; else num_msix += adapter->drv_sds_rings; @@ -686,19 +686,15 @@ int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter *adapter) return -ENOMEM; } -restore: for (vector = 0; vector < num_msix; vector++) adapter->msix_entries[vector].entry = vector; +restore: err = pci_enable_msix(pdev, adapter->msix_entries, num_msix); - if (err == 0) { - adapter->ahw->num_msix = num_msix; - if (adapter->drv_tss_rings > 0) - adapter->drv_tx_rings = adapter->drv_tss_rings; + if (err > 0) { + if (!adapter->drv_tss_rings && !adapter->drv_rss_rings) + return -ENOSPC; - if (adapter->drv_rss_rings > 0) - adapter->drv_sds_rings = adapter->drv_rss_rings; - } else { netdev_info(adapter->netdev, "Unable to allocate %d MSI-X vectors, Available vectors %d\n", num_msix, err); @@ -716,12 +712,20 @@ restore: "Restoring %d Tx, %d SDS rings for total %d vectors.\n", adapter->drv_tx_rings, adapter->drv_sds_rings, num_msix); - goto restore; - err = -EIO; + goto restore; + } else if (err < 0) { + return err; } - return err; + adapter->ahw->num_msix = num_msix; + if (adapter->drv_tss_rings > 0) + adapter->drv_tx_rings = adapter->drv_tss_rings; + + if (adapter->drv_rss_rings > 0) + adapter->drv_sds_rings = adapter->drv_rss_rings; + + return 0; } int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)