Hi,
On 28/06/2017 at 22:07:34 +0200, Arnd Bergmann wrote:
> gcc warns about an unused variable in the new driver:
>
> drivers/rtc/rtc-brcmstb-waketimer.c: In function 'brcmstb_waketmr_settime':
> drivers/rtc/rtc-brcmstb-waketimer.c:142:6: error: unused variable 'ret' [-Werror=unused-variable]
>
> The same function also doesn't handle overflow correctly, this makes
> it return -EINVAL when passed a time that doesn't fit within the
> range of the register.
>
> Fixes: 9f4ad359c801 ("rtc: brcmstb-waketimer: Add Broadcom STB wake-timer")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/rtc/rtc-brcmstb-waketimer.c | 19 ++++++++++++-------
> 1 file changed, 12 insertions(+), 7 deletions(-)
>
I've squashed it in the original commit, I hope this is fine for you.
> diff --git a/drivers/rtc/rtc-brcmstb-waketimer.c b/drivers/rtc/rtc-brcmstb-waketimer.c
> index 5dea6d0627d8..796ac792a381 100644
> --- a/drivers/rtc/rtc-brcmstb-waketimer.c
> +++ b/drivers/rtc/rtc-brcmstb-waketimer.c
> @@ -138,10 +138,12 @@ static int brcmstb_waketmr_settime(struct device *dev,
> struct rtc_time *tm)
> {
> struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
> - unsigned long sec;
> - int ret;
> + time64_t sec;
> +
> + sec = rtc_tm_to_time64(tm);
>
> - rtc_tm_to_time(tm, &sec);
> + if (sec > U32_MAX || sec < 0)
> + return -EINVAL;
>
> writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
>
> @@ -152,14 +154,14 @@ static int brcmstb_waketmr_getalarm(struct device *dev,
> struct rtc_wkalrm *alarm)
> {
> struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
> - unsigned long sec;
> + time64_t sec;
> u32 reg;
>
> sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM);
> if (sec != 0) {
> /* Alarm is enabled */
> alarm->enabled = 1;
> - rtc_time_to_tm(sec, &alarm->time);
> + rtc_time64_to_tm(sec, &alarm->time);
> }
>
> reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
> @@ -172,13 +174,16 @@ static int brcmstb_waketmr_setalarm(struct device *dev,
> struct rtc_wkalrm *alarm)
> {
> struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
> - unsigned long sec;
> + time64_t sec;
>
> if (alarm->enabled)
> - rtc_tm_to_time(&alarm->time, &sec);
> + sec = rtc_tm_to_time64(&alarm->time);
> else
> sec = 0;
>
> + if (sec > U32_MAX || sec < 0)
> + return -EINVAL;
> +
> brcmstb_waketmr_set_alarm(timer, sec);
>
> return 0;
> --
> 2.9.0
>
--
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
