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Subject[PATCH -next] sensors: fix build of pwm-fan.c when THERMAL=m
From: Randy Dunlap <>

Fix build errors when CONFIG_THERMAL=m and SENSORS_PWM_FAN=y
by restricting SENSORS_PWM_FAN to 'm' when THERMAL=m.

drivers/built-in.o: In function `pwm_fan_remove':
pwm-fan.c:(.text+0x22ba58): undefined reference to `thermal_cooling_device_unregister'
drivers/built-in.o: In function `pwm_fan_probe':
pwm-fan.c:(.text+0x22bebb): undefined reference to `thermal_of_cooling_device_register'
pwm-fan.c:(.text+0x22bf11): undefined reference to `thermal_cdev_update'

Signed-off-by: Randy Dunlap <>
Cc: Kamil Debski <>
drivers/hwmon/Kconfig | 1 +
1 file changed, 1 insertion(+)

--- linux-next-20150305.orig/drivers/hwmon/Kconfig
+++ linux-next-20150305/drivers/hwmon/Kconfig
@@ -1174,6 +1174,7 @@ source drivers/hwmon/pmbus/Kconfig
tristate "PWM fan"
depends on (PWM && OF) || COMPILE_TEST
+ depends on THERMAL || THERMAL=n
If you say yes here you get support for fans connected to PWM lines.
The driver uses the generic PWM interface, thus it will work on a

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