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Subject[PATCH v2 4/4] PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
Date
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
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