From patchwork Thu Jan 30 01:41:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 11357329 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 254C31800 for ; Thu, 30 Jan 2020 01:41:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F314C207FF for ; Thu, 30 Jan 2020 01:41:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sh4KnuZP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727164AbgA3Blg (ORCPT ); Wed, 29 Jan 2020 20:41:36 -0500 Received: from mail-ot1-f66.google.com ([209.85.210.66]:46069 "EHLO mail-ot1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726618AbgA3Blg (ORCPT ); Wed, 29 Jan 2020 20:41:36 -0500 Received: by mail-ot1-f66.google.com with SMTP id 59so1579333otp.12; Wed, 29 Jan 2020 17:41:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=2P8mIQM2+gpGwwpWHO7MIWsL+16CozNLtmz3AeK6KJA=; b=sh4KnuZPnRoQwLcdY0e21qeGh/RWA9KkP9Xk6BJa9lr+DwN0U5HxoXsVrMTKefUF2z xwCqC9eiI+Qy/ZyiVxzhWNmb1faaD9Xpv+8eUaRcq1F3y+CmuIpE/RT4Tzv70wMzTY/4 4H3m1olAIjuotpPfb0MQyMYNnFPO8bhpxH0rIJPZV1J3od0WRmrIJj9hvo+R6wfP4FHS y5hqf0Ty2PyndwVfeQkzHspDrb9II6JQj/IrNY+gDfHDSiq7T1pWwBe/+yqWcN2KKQSp dkspeeCwD9+l/kO0PffVUSyHijvVdI8lsEV/dGHJu49spPpLVWzwehLRfREsvZuNa97e 7aAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=2P8mIQM2+gpGwwpWHO7MIWsL+16CozNLtmz3AeK6KJA=; b=V2Tqqnd8qGZC0+cNER460B7wi8zq+03LgnQappyhSjTvBuDjI+crbn4LMdC5QNTJHM 95wIEQLo1MgJy3iz9GQQU/K6k5un9aYOnl7iLWesFDm4DGUmRJwhZVxYLdzNKKyZS/k/ D0ePb+iaID6GP9PS71Iuy3FNtvGmixzkJESbtC+a4uH2n8a0LfTxfrAqYAlCAE+YUoGv nCBuoeSj58NcgTZSybqOTkXDjrONYRR+vr3pSA2IEcr+axK247A0V7q4CaVT+cvYANln aE7GY9Aec9B5n8QePqhNZAeqYBhtJ+leAY09LjdxXvIZ132gR/OPktkC5t0YjAomdtis a3TA== X-Gm-Message-State: APjAAAVbYSwkZR3B/IEx7Z16oQmltiw+fKSE+evtYbdACYhH9Jg7oPN+ eEcU4juny069OU4tAcipOSE= X-Google-Smtp-Source: APXvYqwx8XNMC2oG239rd8MwmWT71BEAXssFRVi4DTH6NF10X2y0cEiI33G9V1m33fi6InTuE/2zRw== X-Received: by 2002:a9d:8f1:: with SMTP id 104mr1637192otf.107.1580348495040; Wed, 29 Jan 2020 17:41:35 -0800 (PST) Received: from localhost.localdomain ([2604:1380:4111:8b00::1]) by smtp.gmail.com with ESMTPSA id j45sm1313526ota.59.2020.01.29.17.41.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2020 17:41:33 -0800 (PST) From: Nathan Chancellor To: Niklas Cassel Cc: Andy Gross , Bjorn Andersson , Kevin Hilman , Nishanth Menon , "Rafael J. Wysocki" , linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor Subject: [PATCH] power: avs: qcom-cpr: Avoid clang -Wsometimes-uninitialized in cpr_scale Date: Wed, 29 Jan 2020 18:41:30 -0700 Message-Id: <20200130014130.51313-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 X-Patchwork-Bot: notify Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Clang warns (trimmed for brevity): ../drivers/power/avs/qcom-cpr.c:570:13: warning: variable 'reg_mask' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] ../drivers/power/avs/qcom-cpr.c:520:13: warning: variable 'new_uV' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] Due to the fact that Clang's static analysis happens before any optimization passes are taken into account, it cannot see that both branches in the if statement must be taken because dir cannot be something other than UP or DOWN due to the check at the top of this function. Change the else if condition to else to fix this false positive. Fixes: bf6910abf548 ("power: avs: Add support for CPR (Core Power Reduction)") Link: https://github.com/ClangBuiltLinux/linux/issues/840 Signed-off-by: Nathan Chancellor Acked-by: Kevin Hilman --- drivers/power/avs/qcom-cpr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/power/avs/qcom-cpr.c b/drivers/power/avs/qcom-cpr.c index 9192fb747653..e8831e4aee05 100644 --- a/drivers/power/avs/qcom-cpr.c +++ b/drivers/power/avs/qcom-cpr.c @@ -517,7 +517,7 @@ static int cpr_scale(struct cpr_drv *drv, enum voltage_change_dir dir) dev_dbg(drv->dev, "UP: -> new_uV: %d last_uV: %d perf state: %u\n", new_uV, last_uV, cpr_get_cur_perf_state(drv)); - } else if (dir == DOWN) { + } else { if (desc->clamp_timer_interval && error_steps < desc->down_threshold) { /* @@ -567,7 +567,7 @@ static int cpr_scale(struct cpr_drv *drv, enum voltage_change_dir dir) /* Disable auto nack down */ reg_mask = RBCPR_CTL_SW_AUTO_CONT_NACK_DN_EN; val = 0; - } else if (dir == DOWN) { + } else { /* Restore default threshold for UP */ reg_mask = RBCPR_CTL_UP_THRESHOLD_MASK; reg_mask <<= RBCPR_CTL_UP_THRESHOLD_SHIFT;