[PATCH v2] ufs: core: fix deadlock when rtc update

[Bean Huo]

On Mon, 2024-07-15 at 14:38 +0800, peter.wang at mediatek.com wrote:
> -       ufshcd_rpm_get_sync(hba);
> +       /* Skip update RTC if RPM state is not RPM_ACTIVE */
> +       if (ufshcd_rpm_get_if_active(hba) <= 0)
> +               return;

I understood your intention of this 'retun', but my understanding is
you assume that __ufshcd_wl_resume() will schedule rtc update work,
however, before the time that __ufshcd_wl_resume() completes, the RPM
status is not RPM_ACTIVE until __ufshcd_wl_resume() completes and
__update_runtime_status(dev, RPM_ACTIVE) is called.

If rtc update work is performed before __update_runtime_status(dev,
RPM_ACTIVE), here you return, then no RTC work will be scheduled.

do you think it is possible?