linux-kernel - [V2][PATCH] cpufreq: dt: check the -EPROBE_DEFER error returned by dev_pm_opp_of_cpumask_add

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Message-Id: <20210325064208.2291413-1-quanyang.wang@windriver.com>
Date:   Thu, 25 Mar 2021 14:42:08 +0800
From:   quanyang.wang@...driver.com
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Quanyang Wang <quanyang.wang@...driver.com>
Subject: [V2][PATCH] cpufreq: dt: check the -EPROBE_DEFER error returned by dev_pm_opp_of_cpumask_add_table

From: Quanyang Wang <quanyang.wang@...driver.com>

The function dev_pm_opp_of_cpumask_add_table may return -EPROBE_DEFER
which comes from clk_get(dev, NULL) in _update_opp_table_clk. Ignoring
this error and call the next function  dev_pm_opp_of_cpumask_add_table
may cause dt_cpufreq_probe return -ENODEV instead of -EPROBE_DEFER.
And this will result cpufreq-dt driver probe failure.

Add check condition to fix this issue.

Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
---
 drivers/cpufreq/cpufreq-dt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index b1e1bdc63b01..25e46df92941 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -257,7 +257,12 @@ static int dt_cpufreq_early_init(struct device *dev, int cpu)
 	 *
 	 * OPPs might be populated at runtime, don't check for error here.
 	 */
-	if (!dev_pm_opp_of_cpumask_add_table(priv->cpus))
+	ret = dev_pm_opp_of_cpumask_add_table(priv->cpus);
+	if (ret) {
+		/* Return the -EPROBE_DEFER error to trigger the deferred probe. */
+		if (ret == -EPROBE_DEFER)
+			goto out;
+	} else
 		priv->have_static_opps = true;
 
 	/*
-- 
2.25.1