From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: [PATCH V2 3/5] thermal: devfreq: Check OPP for errors Date: Tue, 7 Feb 2017 09:40:03 +0530 Message-ID: <06c4a7a43d537bf078f6ac72187853e11bd0384e.1486440448.git.viresh.kumar@linaro.org> References: <79611a51240c83504c35a8739fe8e1837e903671.1486440448.git.viresh.kumar@linaro.org> Return-path: Received: from mail-pg0-f42.google.com ([74.125.83.42]:33822 "EHLO mail-pg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752783AbdBGEKR (ORCPT ); Mon, 6 Feb 2017 23:10:17 -0500 Received: by mail-pg0-f42.google.com with SMTP id 14so34617122pgg.1 for ; Mon, 06 Feb 2017 20:10:17 -0800 (PST) In-Reply-To: <79611a51240c83504c35a8739fe8e1837e903671.1486440448.git.viresh.kumar@linaro.org> In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Rafael Wysocki , rui.zhang@intel.com, edubezval@gmail.com Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Vincent Guittot , dan.carpenter@oracle.com, Viresh Kumar It is possible for dev_pm_opp_find_freq_exact() to return errors. It was all fine earlier as dev_pm_opp_get_voltage() had a check within it to check for invalid OPPs, but dev_pm_opp_put() doesn't have any similar checks and the callers need to make sure OPP is valid before calling them. Also update the later dev_warn_ratelimited() to not print the error message as the OPP is guaranteed to be valid now. Reported-by: Dan Carpenter Signed-off-by: Viresh Kumar --- drivers/thermal/devfreq_cooling.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index 218ccc30c7ad..74d4846c66cd 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -225,13 +225,19 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq) if (PTR_ERR(opp) == -ERANGE) opp = dev_pm_opp_find_freq_exact(dev, freq, false); + if (IS_ERR(opp)) { + dev_err_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n", + freq, PTR_ERR(opp)); + return 0; + } + voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */ dev_pm_opp_put(opp); if (voltage == 0) { dev_err_ratelimited(dev, - "Failed to get voltage for frequency %lu: %ld\n", - freq, IS_ERR(opp) ? PTR_ERR(opp) : 0); + "Failed to get voltage for frequency %lu\n", + freq); return 0; } -- 2.7.1.410.g6faf27b