• Axel Lin's avatar
    hwmon: (lm77) Prevent overflow problem when writing large limits · 99765db2
    Axel Lin authored
    On platforms with sizeof(int) < sizeof(long), writing a temperature
    limit larger than MAXINT will result in unpredictable limit values
    written to the chip.
    Clamp the input values to the supported limits first to fix the problem.
    
    For set_temp_hyst:
    As Guenter pointed out that the temperature is read as unsigned and stored in
    an unsigned long. This is wrong; nothing in the datasheet suggests that the
    value (the absolute temperature) must be positive.
    So change it to signed.
    Signed-off-by: default avatarAxel Lin <axel.lin@ingics.com>
    Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
    99765db2
lm77.c 10.6 KB