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Commit 9fb6c9c7 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (coretemp) Refine TjMax detection 



Intel's turbostat code uses only 7 bits from MSR_IA32_TEMPERATURE_TARGET to
read TjMax, and also only accepts it if the reported temperature is at least
85 degrees C. Play safe and do the same.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 347c16cf

drivers/hwmon/coretemp.c

+2 −2
Original line number Diff line number Diff line
@@ -368,12 +368,12 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) 
		if (cpu_has_tjmax(c))

			dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);

	} else {

		val = (eax >> 16) & 0xff;

		val = (eax >> 16) & 0x7f;

		/*

		 * If the TjMax is not plausible, an assumption

		 * will be used

		 */

		if (val) {

		if (val >= 85) {

			dev_dbg(dev, "TjMax is %d degrees C\n", val);

			return val * 1000;

		}