• Amelie Delaunay's avatar
    rtc: stm32: fix comparison warnings · 1d70ba3b
    Amelie Delaunay authored
    This patches fixes comparison between signed and unsigned values as it
    could produce an incorrect result when the signed value is converted to
    unsigned:
    
    drivers/rtc/rtc-stm32.c: In function 'stm32_rtc_valid_alrm':
    drivers/rtc/rtc-stm32.c:404:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if ((((tm->tm_year > cur_year) &&
    ...
    
    It also fixes comparison always true or false due to the fact that unsigned
    value is compared against zero with >= or <:
    
    drivers/rtc/rtc-stm32.c: In function 'stm32_rtc_init':
    drivers/rtc/rtc-stm32.c:514:35: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
      for (pred_a = pred_a_max; pred_a >= 0; pred_a-- ) {
    
    drivers/rtc/rtc-stm32.c:530:44: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
         (rate - ((pred_a + 1) * (pred_s + 1)) < 0) ?
    
    Fixes: 4e64350f ("rtc: add STM32 RTC driver")
    Signed-off-by: default avatarAmelie Delaunay <amelie.delaunay@st.com>
    Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
    1d70ba3b
rtc-stm32.c 19.4 KB