From patchwork Thu Nov 16 18:34:38 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 838744 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3yd9002ZPjz9s03 for ; Fri, 17 Nov 2017 05:34:56 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966698AbdKPSeu (ORCPT ); Thu, 16 Nov 2017 13:34:50 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:33017 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966691AbdKPSeo (ORCPT ); Thu, 16 Nov 2017 13:34:44 -0500 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id 84D65180EA; Thu, 16 Nov 2017 19:34:40 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at bastet.se.axis.com Received: from bastet.se.axis.com ([IPv6:::ffff:127.0.0.1]) by localhost (bastet.se.axis.com [::ffff:127.0.0.1]) (amavisd-new, port 10024) with LMTP id 141ENmLOd_Wt; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: from boulder03.se.axis.com (boulder03.se.axis.com [10.0.8.17]) by bastet.se.axis.com (Postfix) with ESMTPS id C2BE018133; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A6CC81E07B; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9B2331E079; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: from thoth.se.axis.com (unknown [10.0.2.173]) by boulder03.se.axis.com (Postfix) with ESMTP; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: from lnxartpec1.se.axis.com (lnxartpec1.se.axis.com [10.88.4.10]) by thoth.se.axis.com (Postfix) with ESMTP id 8EC91FA1; Thu, 16 Nov 2017 19:34:39 +0100 (CET) Received: by lnxartpec1.se.axis.com (Postfix, from userid 20283) id 886D9400FC; Thu, 16 Nov 2017 19:34:39 +0100 (CET) From: Niklas Cassel To: Jingoo Han , Joao Pinto , Bjorn Helgaas Cc: Niklas Cassel , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] PCI: designware-ep: use ffz() instead of find_first_zero_bit() Date: Thu, 16 Nov 2017 19:34:38 +0100 Message-Id: <20171116183438.12613-1-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 X-TM-AS-GCONF: 00 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org find_first_zero_bit()'s parameter 'size' is defined in bits, not in bytes. find_first_zero_bit() was called with bytes rather than bits, which thus defined a too low upper limit, causing dw_pcie_ep_inbound_atu() to assign iatu index #4 to both bar 4 and bar 5, which made bar 5 overwrite the settings set by bar 4. ./pcitest.sh BAR tests BAR0: OKAY BAR1: OKAY BAR2: OKAY BAR3: OKAY BAR4: NOT OKAY BAR5: OKAY Fix this by using replacing find_first_zero_bit() with ffz(), since ffz() only works on a single 'unsigned long' and therefore does not need a size argument. Signed-off-by: Niklas Cassel --- drivers/pci/dwc/pcie-designware-ep.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index d53d5f168363..ab9a9e160daf 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -70,8 +70,7 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar, u32 free_win; struct dw_pcie *pci = to_dw_pcie_from_ep(ep); - free_win = find_first_zero_bit(&ep->ib_window_map, - sizeof(ep->ib_window_map)); + free_win = ffz(ep->ib_window_map); if (free_win >= ep->num_ib_windows) { dev_err(pci->dev, "no free inbound window\n"); return -EINVAL; @@ -96,8 +95,7 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr, u32 free_win; struct dw_pcie *pci = to_dw_pcie_from_ep(ep); - free_win = find_first_zero_bit(&ep->ob_window_map, - sizeof(ep->ob_window_map)); + free_win = ffz(ep->ob_window_map); if (free_win >= ep->num_ob_windows) { dev_err(pci->dev, "no free outbound window\n"); return -EINVAL;