Hi all,
Gentle ping. Are we happy with this patch as it fixes re-bind failure on RTC subsystem?
Cheers,
Biju
> From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> Sent: Friday, September 22, 2023 9:12 AM
> Subject: [PATCH v2] alarmtimer: Fix rebind failure
>
> The resources allocated in alarmtimer_rtc_add_device() are not freed
> leading to re-bind failure for the endpoint driver. Fix this issue by
> adding alarmtimer_rtc_remove_device().
>
> Fixes: c79108bd19a8 ("alarmtimer: Make alarmtimer platform device child of
> RTC device")
> Fixes: 7c94caca877b ("alarmtimer: Use wakeup source from alarmtimer
> platform device")
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> ---
> v1->v2:
> * Add fixes tag.
> * Replaced the variable rtc_pdev->alarmtimer_pdev
> * Added the check rtcdev == rtc before unregistering the real alarmtimer.
> Note:
> This issue is found while adding irq support for built in RTC found on
> Renesas PMIC RAA215300 device. This issue should present on all RTC
> drivers which calls device_init_wakeup() in probe().
> ---
> kernel/time/alarmtimer.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index
> 8d9f13d847f0..04d67de8b1fe 100644
> --- a/kernel/time/alarmtimer.c
> +++ b/kernel/time/alarmtimer.c
> @@ -61,6 +61,7 @@ static DEFINE_SPINLOCK(freezer_delta_lock);
> /* rtc timer and device for setting alarm wakeups at suspend */
> static struct rtc_timer rtctimer;
> static struct rtc_device *rtcdev;
> +static struct platform_device *alarmtimer_pdev;
> static DEFINE_SPINLOCK(rtcdev_lock);
>
> /**
> @@ -109,6 +110,7 @@ static int alarmtimer_rtc_add_device(struct device
> *dev)
> }
>
> rtcdev = rtc;
> + alarmtimer_pdev = pdev;
> /* hold a reference so it doesn't go away */
> get_device(dev);
> pdev = NULL;
> @@ -123,6 +125,22 @@ static int alarmtimer_rtc_add_device(struct device
> *dev)
> return ret;
> }
>
> +static void alarmtimer_rtc_remove_device(struct device *dev) {
> + struct rtc_device *rtc = to_rtc_device(dev);
> +
> + if (rtcdev == rtc) {
> + module_put(rtc->owner);
> + if (device_may_wakeup(rtc->dev.parent))
> + device_init_wakeup(&alarmtimer_pdev->dev, false);
> +
> + platform_device_unregister(alarmtimer_pdev);
> + put_device(dev);
> + alarmtimer_pdev = NULL;
> + rtcdev = NULL;
> + }
> +}
> +
> static inline void alarmtimer_rtc_timer_init(void) {
> rtc_timer_init(&rtctimer, NULL, NULL); @@ -130,6 +148,7 @@ static
> inline void alarmtimer_rtc_timer_init(void)
>
> static struct class_interface alarmtimer_rtc_interface = {
> .add_dev = &alarmtimer_rtc_add_device,
> + .remove_dev = &alarmtimer_rtc_remove_device,
> };
>
> static int alarmtimer_rtc_interface_setup(void)
> --
> 2.25.1
