[PATCH v2 4/4] PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-09-20 21:03:23
Also in:
linux-tegra, lkml
Subsystem:
device frequency (devfreq), memory frequency scaling drivers for nvidia tegra, the rest · Maintainers:
MyungJoo Ham, Kyungmin Park, Chanwoo Choi, Dmitry Osipenko, Linus Torvalds
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> --- drivers/devfreq/tegra30-devfreq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index d83fdc2713ed..65ecf17a36f4 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;
--
2.32.0