hwmon: (aspeed-pwm-tacho) On read failure return -ETIMEDOUT
When the controller fails to provide an RPM reading within the alloted time; the driver returns -ETIMEDOUT and no file contents. Signed-off-by: Patrick Venture <venture@google.com> Fixes: 2d7a548a ("drivers: hwmon: Support for ASPEED PWM/Fan tach") Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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