From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Fri, 14 Jun 2024 15:40:15 +0000 (+0100)
Subject: platform: mips: cpu_hwmon: Disable driver on unsupported hardware
X-Git-Tag: v6.10.3~100
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=378a9d51afc17c9db7a0d5280228361d65ce9b28;p=thirdparty%2Fkernel%2Fstable.git

platform: mips: cpu_hwmon: Disable driver on unsupported hardware

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>
---

diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c
index d8c5f9195f85f..2ac2f31090f96 100644
--- a/drivers/platform/mips/cpu_hwmon.c
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -139,6 +139,9 @@ static int __init loongson_hwmon_init(void)
 		csr_temp_enable = csr_readl(LOONGSON_CSR_FEATURES) &
 				  LOONGSON_CSRF_TEMP;
 
+	if (!csr_temp_enable && !loongson_chiptemp[0])
+		return -ENODEV;
+
 	nr_packages = loongson_sysconf.nr_cpus /
 		loongson_sysconf.cores_per_package;