[PATCH 4.19 091/196] platform: mips: cpu_hwmon: Disable driver on unsupported hardware

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiaxun Yang <jiaxun.yang@flygoat.com>

commit f4d430db17b4ef4e9c3c352a04b2fe3c93011978 upstream.

cpu_hwmon is unsupported on CPUs without loongson_chiptemp
register and csr.

Cc: stable@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/platform/mips/cpu_hwmon.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/platform/mips/cpu_hwmon.c
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -164,6 +164,9 @@ static int __init loongson_hwmon_init(vo
 		goto fail_hwmon_device_register;
 	}
 
+	if (!csr_temp_enable && !loongson_chiptemp[0])
+		return -ENODEV;
+
 	nr_packages = loongson_sysconf.nr_cpus /
 		loongson_sysconf.cores_per_package;