[PATCH 2/2] serial: msm-geni: handle devm_clk_get() errors

[Caleb Connolly]

devm_clk_get() returns an ERR_PTR on failure, not null. Fix the check to
avoid the board crashing when the clock isn't available.

Additionally, add the missing error handling for this function.

Fixes: 324df15a292e ("serial: qcom: add support for GENI serial driver")
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 drivers/serial/serial_msm_geni.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/serial/serial_msm_geni.c b/drivers/serial/serial_msm_geni.c
index 3e2e15b6cefe..0eee776fe8a4 100644
--- a/drivers/serial/serial_msm_geni.c
+++ b/drivers/serial/serial_msm_geni.c
@@ -189,8 +189,8 @@ static int geni_serial_set_clock_rate(struct udevice *dev, u64 rate)
 	int ret;
 
 	clk = devm_clk_get(dev, NULL);
-	if (!clk)
-		return -EINVAL;
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
 	ret = clk_set_rate(clk, rate);
 	return ret;
@@ -249,11 +249,16 @@ static int msm_serial_setbrg(struct udevice *dev, int baud)
 	struct msm_serial_data *priv = dev_get_priv(dev);
 	u64 clk_rate;
 	u32 clk_div;
+	int ret;
 
 	priv->baud = baud;
 
 	clk_rate = get_clk_div_rate(baud, priv->oversampling, &clk_div);
-	geni_serial_set_clock_rate(dev, clk_rate);
+	ret = geni_serial_set_clock_rate(dev, clk_rate);
+	if (ret < 0) {
+		pr_err("%s: Couldn't set clock rate: %d\n", __func__, ret);
+		return ret;
+	}
 	geni_serial_baud(priv->base, clk_div, baud);
 
 	return 0;

-- 
2.42.1