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| author | Amelie Delaunay <amelie.delaunay@st.com> | 2017-01-16 11:08:53 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-01-23 00:47:15 +0100 |
| commit | 1d70ba3bfb30cf8d151f18f5bf7d7a218ecede57 (patch) | |
| tree | cef5a5b02f011e0206654f8e029de50c145f7ffc /drivers/rtc/rtc-stm32.c | |
| parent | a560c527638d78bc05d06585fef2d94b22b727b8 (diff) | |
| download | lwn-1d70ba3bfb30cf8d151f18f5bf7d7a218ecede57.tar.gz lwn-1d70ba3bfb30cf8d151f18f5bf7d7a218ecede57.zip | |
rtc: stm32: fix comparison warnings
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: 4e64350f42e2 ("rtc: add STM32 RTC driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc/rtc-stm32.c')
| -rw-r--r-- | drivers/rtc/rtc-stm32.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c index 03c97c1a2140..bd57eb1029e1 100644 --- a/drivers/rtc/rtc-stm32.c +++ b/drivers/rtc/rtc-stm32.c @@ -383,7 +383,7 @@ static int stm32_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) static int stm32_rtc_valid_alrm(struct stm32_rtc *rtc, struct rtc_time *tm) { - unsigned int cur_day, cur_mon, cur_year, cur_hour, cur_min, cur_sec; + int cur_day, cur_mon, cur_year, cur_hour, cur_min, cur_sec; unsigned int dr = readl_relaxed(rtc->base + STM32_RTC_DR); unsigned int tr = readl_relaxed(rtc->base + STM32_RTC_TR); @@ -509,7 +509,7 @@ static int stm32_rtc_init(struct platform_device *pdev, pred_a_max = STM32_RTC_PRER_PRED_A >> STM32_RTC_PRER_PRED_A_SHIFT; pred_s_max = STM32_RTC_PRER_PRED_S >> STM32_RTC_PRER_PRED_S_SHIFT; - for (pred_a = pred_a_max; pred_a >= 0; pred_a--) { + for (pred_a = pred_a_max; pred_a + 1 > 0; pred_a--) { pred_s = (rate / (pred_a + 1)) - 1; if (((pred_s + 1) * (pred_a + 1)) == rate) @@ -525,7 +525,7 @@ static int stm32_rtc_init(struct platform_device *pdev, pred_s = (rate / (pred_a + 1)) - 1; dev_warn(&pdev->dev, "ck_rtc is %s\n", - (rate - ((pred_a + 1) * (pred_s + 1)) < 0) ? + (rate < ((pred_a + 1) * (pred_s + 1))) ? "fast" : "slow"); } |