hwmon: (dell-smm) Blacklist Dell Studio XPS 8100

CPU fan speed going up and down on Dell Studio XPS 8100 for
unknown reasons. Without further debugging on the affected
machine, it is not possible to find the problem.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=100121
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Jan C Peters <jcpeters89@gmail.com>
Cc: stable@vger.kernel.org # v4.0+, will need backport
[groeck: cleaned up description, comments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 37c16afe007a0524eaacb5edcae9399bebfae897..c8487894b31236cefd761b24cac48fb4e17e6d52 100644 (file)
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -929,6 +929,21 @@ static struct dmi_system_id i8k_dmi_table[] __initdata = {
 
 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
 
+static struct dmi_system_id i8k_blacklist_dmi_table[] __initdata = {
+       {
+               /*
+                * CPU fan speed going up and down on Dell Studio XPS 8100
+                * for unknown reasons.
+                */
+               .ident = "Dell Studio XPS 8100",
+               .matches = {
+                       DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                       DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
+               },
+       },
+       { }
+};
+
 /*
  * Probe for the presence of a supported laptop.
  */
@@ -940,7 +955,8 @@ static int __init i8k_probe(void)
        /*
         * Get DMI information
         */
-       if (!dmi_check_system(i8k_dmi_table)) {
+       if (!dmi_check_system(i8k_dmi_table) ||
+           dmi_check_system(i8k_blacklist_dmi_table)) {
                if (!ignore_dmi && !force)
                        return -ENODEV;