From: Dmitry Osipenko <digetx@gmail.com>
Date: Mon, 20 Sep 2021 17:22:49 +0000 (+0300)
Subject: PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4844bdbe9166bc3d194b1d20d13dc1f01d3c1bb7;p=linux.git

PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate

EMC clock is always-on and can't be zero. Check whether clk_round_rate()
returns zero rate and error out if it does. It can return zero if clock
tree isn't initialized properly.

Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index d83fdc2713eda..65ecf17a36f49 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -891,9 +891,9 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
 		return err;
 
 	rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
-	if (rate < 0) {
+	if (rate <= 0) {
 		dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate);
-		return rate;
+		return rate ?: -EINVAL;
 	}
 
 	tegra->max_freq = rate / KHZ;