[PATCH 5.15 540/731] rtc: cmos: Fix wake alarm breakage

Greg Kroah-Hartman
2022-12-28T15:38:19Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

[ Upstream commit 0782b66ed2fbb035dda76111df0954515e417b24 ]

Commit 4919d3eb2ec0 ("rtc: cmos: Fix event handler registration
ordering issue") overlooked the fact that cmos_do_probe() depended
on the preparations carried out by cmos_wake_setup() and the wake
alarm stopped working after the ordering of them had been changed.

Address this by partially reverting commit 4919d3eb2ec0 so that
cmos_wake_setup() is called before cmos_do_probe() again and moving
the rtc_wake_setup() invocation from cmos_wake_setup() directly to the
callers of cmos_do_probe() where it will happen after a successful
completion of the latter.

Fixes: 4919d3eb2ec0 ("rtc: cmos: Fix event handler registration ordering issue")
Reported-by: Zhang Rui <rui.zhang@intel.com>
Reported-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/5887691.lOV4Wx5bFT@kreacher
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Stable-dep-of: 83ebb7b3036d ("rtc: cmos: Disable ACPI RTC event on removal")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/rtc/rtc-cmos.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 610413b4e9ca..01fb31f8e534 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -1233,6 +1233,9 @@ static u32 rtc_handler(void *context)

static inline void rtc_wake_setup(struct device *dev)
{
+ if (acpi_disabled)
+ return;
+
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
/*
* After the RTC handler is installed, the Fixed_RTC event should
@@ -1286,7 +1289,6 @@ static void cmos_wake_setup(struct device *dev)

use_acpi_alarm_quirks();

- rtc_wake_setup(dev);
acpi_rtc_info.wake_on = rtc_wake_on;
acpi_rtc_info.wake_off = rtc_wake_off;

@@ -1354,6 +1356,8 @@ static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
{
int irq, ret;

+ cmos_wake_setup(&pnp->dev);
+
if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0)) {
irq = 0;
#ifdef CONFIG_X86
@@ -1372,7 +1376,7 @@ static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
if (ret)
return ret;

- cmos_wake_setup(&pnp->dev);
+ rtc_wake_setup(&pnp->dev);

return 0;
}
@@ -1461,6 +1465,7 @@ static int __init cmos_platform_probe(struct platform_device *pdev)
int irq, ret;

cmos_of_init(pdev);
+ cmos_wake_setup(&pdev->dev);

if (RTC_IOMAPPED)
resource = platform_get_resource(pdev, IORESOURCE_IO, 0);
@@ -1474,7 +1479,7 @@ static int __init cmos_platform_probe(struct platform_device *pdev)
if (ret)
return ret;

- cmos_wake_setup(&pdev->dev);
+ rtc_wake_setup(&pdev->dev);

return 0;
}
--
2.35.1