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rtc: cmos: Disable ACPI RTC event on removal

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Make cmos_do_remove() drop the ACPI RTC fixed event handler so as to
prevent it from operating on stale data in case the event triggers
after driver removal.

Fixes: 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/2224609.iZASKD2KPV@kreacher
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Rafael J. Wysocki
2022-11-09 13:15:36 +01:00
committed by Alexandre Belloni
parent d13e9ad9f5
commit 83ebb7b303
1 changed files with 15 additions and 0 deletions
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15
drivers/rtc/rtc-cmos.c
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@@ -798,6 +798,14 @@ static void acpi_rtc_event_setup(struct device *dev)
acpi_disable_event(ACPI_EVENT_RTC, 0); acpi_disable_event(ACPI_EVENT_RTC, 0);
} }
static void acpi_rtc_event_cleanup(void)
{
if (acpi_disabled)
return;
acpi_remove_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler);
}
static void rtc_wake_on(struct device *dev) static void rtc_wake_on(struct device *dev)
{ {
acpi_clear_event(ACPI_EVENT_RTC); acpi_clear_event(ACPI_EVENT_RTC);
@@ -884,6 +892,10 @@ static inline void acpi_rtc_event_setup(struct device *dev)
{ {
} }
static inline void acpi_rtc_event_cleanup(void)
{
}
static inline void acpi_cmos_wake_setup(struct device *dev) static inline void acpi_cmos_wake_setup(struct device *dev)
{ {
} }
@@ -1138,6 +1150,9 @@ static void cmos_do_remove(struct device *dev)
hpet_unregister_irq_handler(cmos_interrupt); hpet_unregister_irq_handler(cmos_interrupt);
} }
if (!dev_get_platdata(dev))
acpi_rtc_event_cleanup();
cmos->rtc = NULL; cmos->rtc = NULL;
ports = cmos->iomem; ports = cmos->iomem;