[PATCH] dell-smm-hwmon: Blacklist Dell Studio XPS 8100

[PATCH] dell-smm-hwmon: Blacklist Dell Studio XPS 8100

[Pali Rohár]

CPU fan speed going up and down on Dell Studio XPS 8100 for
unknown reason. Without future debuggning on affected machine
it is not possible to detect where is problem. For more see:
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 # before v4.2 apply to file drivers/char/i8k.c
---
 drivers/hwmon/dell-smm-hwmon.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 37c16af..92c572c 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -929,6 +929,23 @@ 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 reason. Without future debuggning on affected machine
+		 * it is not possible to detect where is problem. For more see:
+		 * https://bugzilla.kernel.org/show_bug.cgi?id=100121
+		 */
+		.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 +957,8 @@ 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;
 
-- 
1.7.9.5

Re: [PATCH] dell-smm-hwmon: Blacklist Dell Studio XPS 8100

[Guenter Roeck]

On 07/30/2015 11:41 AM, Pali Rohár wrote:
> CPU fan speed going up and down on Dell Studio XPS 8100 for
> unknown reason. Without future debuggning on affected machine
> it is not possible to detect where is problem. For more see:
> 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 # before v4.2 apply to file drivers/char/i8k.c

Applied, after fixing up description and comments.

After it is applied to mainline, you'll probably get a note
from Greg, asking you to back-port the patch to 4.1.

Thanks,
Guenter