From 4d7ef8a2be2b60709f292da699bb6690564e7c4e Mon Sep 17 00:00:00 2001
From: Ian Lepore <ian@FreeBSD.org>
Date: Sat, 15 Jun 2019 16:59:03 +0000
Subject: [PATCH] Handle failure to enable the clock or obtain its frequency.

---
 sys/arm/allwinner/aw_pwm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/arm/allwinner/aw_pwm.c b/sys/arm/allwinner/aw_pwm.c
index 2cd3aa650faa..96a57348323e 100644
--- a/sys/arm/allwinner/aw_pwm.c
+++ b/sys/arm/allwinner/aw_pwm.c
@@ -150,8 +150,16 @@ aw_pwm_attach(device_t dev)
 		goto fail;
 	}
 	error = clk_enable(sc->clk);
+	if (error != 0) {
+		device_printf(dev, "cannot enable clock\n");
+		goto fail;
+	}
 
 	error = clk_get_freq(sc->clk, &sc->clk_freq);
+	if (error != 0) {
+		device_printf(dev, "cannot get clock frequency\n");
+		goto fail;
+	}
 
 	if (bus_alloc_resources(dev, aw_pwm_spec, &sc->res) != 0) {
 		device_printf(dev, "cannot allocate resources for device\n");