[PATCH 3/4] i2c: uniphier_f: error out if clock rate is zero

From: Masahiro Yamada
Date: Mon Nov 30 2015 - 04:54:38 EST


This input clock is used to generate the sampling clock for I2C bus.
If the clock rate is zero, there is something wrong with the clock
driver. Bail out with the appropriate error message in such a case.
It would make it easier to find the root cause of failure.

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

drivers/i2c/busses/i2c-uniphier-f.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-uniphier-f.c b/drivers/i2c/busses/i2c-uniphier-f.c
index e8d03bc..67109e1 100644
--- a/drivers/i2c/busses/i2c-uniphier-f.c
+++ b/drivers/i2c/busses/i2c-uniphier-f.c
@@ -481,6 +481,10 @@ static int uniphier_fi2c_clk_init(struct device *dev,
return ret;

clk_rate = clk_get_rate(priv->clk);
+ if (!clk_rate) {
+ dev_err(dev, "input clock rate should not be zero\n");
+ return -EINVAL;
+ }

uniphier_fi2c_reset(priv);

@@ -531,7 +535,7 @@ static int uniphier_fi2c_probe(struct platform_device *pdev)

ret = uniphier_fi2c_clk_init(dev, priv);
if (ret)
- return ret;
+ goto err;

ret = devm_request_irq(dev, irq, uniphier_fi2c_interrupt, 0,
pdev->name, priv);
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/