From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934277AbcJTIpX (ORCPT ); Thu, 20 Oct 2016 04:45:23 -0400 Received: from mail-pf0-f181.google.com ([209.85.192.181]:35537 "EHLO mail-pf0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934234AbcJTIpT (ORCPT ); Thu, 20 Oct 2016 04:45:19 -0400 From: Viresh Kumar To: Rafael Wysocki , nm@ti.com, sboyd@codeaurora.org, Viresh Kumar Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Vincent Guittot , robh@kernel.org, d-gerlach@ti.com, broonie@kernel.org, Viresh Kumar Subject: [PATCH V2 2/8] PM / OPP: Don't use OPP structure outside of rcu protected section Date: Thu, 20 Oct 2016 14:14:56 +0530 Message-Id: <7a0754e64236db2a977c6a6402c222fea6dc866d.1476952750.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.7.1.410.g6faf27b In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The OPP structure must not be used out of the rcu protected section. Cache the values to be used in separate variables instead. Signed-off-by: Viresh Kumar --- drivers/base/power/opp/core.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 4c7c6da7a989..056527a3fb4e 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -584,6 +584,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) struct clk *clk; unsigned long freq, old_freq; unsigned long u_volt, u_volt_min, u_volt_max; + unsigned long old_u_volt, old_u_volt_min, old_u_volt_max; int ret; if (unlikely(!target_freq)) { @@ -633,6 +634,14 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; } + if (IS_ERR(old_opp)) { + old_u_volt = 0; + } else { + old_u_volt = old_opp->u_volt; + old_u_volt_min = old_opp->u_volt_min; + old_u_volt_max = old_opp->u_volt_max; + } + u_volt = opp->u_volt; u_volt_min = opp->u_volt_min; u_volt_max = opp->u_volt_max; @@ -677,9 +686,10 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) __func__, old_freq); restore_voltage: /* This shouldn't harm even if the voltages weren't updated earlier */ - if (!IS_ERR(old_opp)) - _set_opp_voltage(dev, reg, old_opp->u_volt, - old_opp->u_volt_min, old_opp->u_volt_max); + if (old_u_volt) { + _set_opp_voltage(dev, reg, old_u_volt, old_u_volt_min, + old_u_volt_max); + } return ret; } -- 2.7.1.410.g6faf27b