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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-11-09 13:15:36 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2022-11-15 21:07:14 +0100 |
| commit | 83ebb7b3036d151ee39a4a752018665648fc3bd4 (patch) | |
| tree | 61459796c15c776acdd64b8088e95b889b4d25e2 /drivers/rtc | |
| parent | d13e9ad9f5146f066a5c5a1cc993d09e4fb21ead (diff) | |
| download | linux-stable-83ebb7b3036d151ee39a4a752018665648fc3bd4.tar.gz linux-stable-83ebb7b3036d151ee39a4a752018665648fc3bd4.tar.bz2 linux-stable-83ebb7b3036d151ee39a4a752018665648fc3bd4.zip | |
rtc: cmos: Disable ACPI RTC event on removal
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: 311ee9c151ad ("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>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index 039486bfedf4..00e2ca7374ec 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -798,6 +798,14 @@ static void acpi_rtc_event_setup(struct device *dev) 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) { 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) { } @@ -1138,6 +1150,9 @@ static void cmos_do_remove(struct device *dev) hpet_unregister_irq_handler(cmos_interrupt); } + if (!dev_get_platdata(dev)) + acpi_rtc_event_cleanup(); + cmos->rtc = NULL; ports = cmos->iomem; |