linux-kernel - [PATCH 1/4] PM / devfreq: passive: Fix get_target

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Message-Id: <20210617060546.26933-2-cw00.choi@samsung.com>
Date:   Thu, 17 Jun 2021 15:05:43 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     andrew-sh.cheng@...iatek.com, hsinyi@...omium.org
Cc:     sibis@...eaurora.org, saravanak@...gle.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, chanwoo@...nel.org, cwchoi00@...il.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH 1/4] PM / devfreq: passive: Fix get_target_freq when not
 using required-opp

The 86ad9a24f21e ("PM / devfreq: Add required OPPs support to passive governor")
supported the required-opp property for using devfreq passive governor.
But, 86ad9a24f21e has caused the problem on use-case when required-opp
is not used such as exynos-bus.c devfreq driver. So that fix the
get_target_freq of passive governor for supporting the case of when
required-opp is not used.

Cc: stable@...r.kernel.org
Fixes: 86ad9a24f21e ("PM / devfreq: Add required OPPs support to passive governor")
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/devfreq/governor_passive.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c
index b094132bd20b..fc09324a03e0 100644
--- a/drivers/devfreq/governor_passive.c
+++ b/drivers/devfreq/governor_passive.c
@@ -65,7 +65,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
 		dev_pm_opp_put(p_opp);
 
 		if (IS_ERR(opp))
-			return PTR_ERR(opp);
+			goto no_required_opp;
 
 		*freq = dev_pm_opp_get_freq(opp);
 		dev_pm_opp_put(opp);
@@ -73,6 +73,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
 		return 0;
 	}
 
+no_required_opp:
 	/*
 	 * Get the OPP table's index of decided frequency by governor
 	 * of parent device.
-- 
2.17.1