From patchwork Fri Aug 28 20:28:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Souza, Jose" X-Patchwork-Id: 11743709 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3F02A913 for ; Fri, 28 Aug 2020 20:25:58 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 1EBED20872 for ; Fri, 28 Aug 2020 20:25:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1EBED20872 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8BE386E0D5; Fri, 28 Aug 2020 20:25:56 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id E05976E0D5 for ; Fri, 28 Aug 2020 20:25:54 +0000 (UTC) IronPort-SDR: rlV2JAWvCzK85xkuWMTuUFVEHLPJRXIXIPtd90O+sWsuGV67MDt1H2RVVtdA5Csg9YH5+/zKgl Neb+5vXiwGTQ== X-IronPort-AV: E=McAfee;i="6000,8403,9727"; a="174790738" X-IronPort-AV: E=Sophos;i="5.76,365,1592895600"; d="scan'208";a="174790738" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2020 13:25:54 -0700 IronPort-SDR: Eo1u4U/2X+dc/SjC5lj1+wV+KlrgEvpZpJzi7oiZGGRfDScQjXNUsQkhd4Y+gqW9eY/DVEQvU3 t7m4qox1xfAg== X-IronPort-AV: E=Sophos;i="5.76,365,1592895600"; d="scan'208";a="501156189" Received: from unknown (HELO josouza-MOBL2.intel.com) ([10.24.14.51]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2020 13:25:54 -0700 From: =?utf-8?q?Jos=C3=A9_Roberto_de_Souza?= To: intel-gfx@lists.freedesktop.org Date: Fri, 28 Aug 2020 13:28:30 -0700 Message-Id: <20200828202830.7165-1-jose.souza@intel.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH CI] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Nathan Chancellor Clang warns: drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable 'ret' is uninitialized when used here [-Wuninitialized] ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy), ^~~ drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize the variable 'ret' to silence this warning bool ret; ^ = 0 1 warning generated. In practice, the bug this warning appears to be concerned with would not actually matter because ret gets initialized to the return value of cnl_verify_procmon_ref_values. However, that does appear to be a bug since it means the first hunk of the patch this fixes won't actually do anything (since the values of check_phy_reg won't factor into the final ret value). Initialize ret to true then make all of the assignments a bitwise AND with itself so that the function always does what it should do. Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step") Link: https://github.com/ClangBuiltLinux/linux/issues/1094 Signed-off-by: Nathan Chancellor Reviewed-by: Matt Roper --- drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c index eccaa79cb4a9..a4b8aa6d0a9e 100644 --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c @@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy) static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, enum phy phy) { - bool ret; + bool ret = true; u32 expected_val = 0; if (!icl_combo_phy_enabled(dev_priv, phy)) @@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, DCC_MODE_SELECT_CONTINUOSLY); } - ret = cnl_verify_procmon_ref_values(dev_priv, phy); + ret &= cnl_verify_procmon_ref_values(dev_priv, phy); if (phy_is_master(dev_priv, phy)) { ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),