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Message-Id: <20220710164026.541466-1-r.stratiienko@gmail.com>
Date: Sun, 10 Jul 2022 19:40:26 +0300
From: Roman Stratiienko <r.stratiienko@...il.com>
To: linux-pm@...r.kernel.org
Cc: rafael@...nel.org, daniel.lezcano@...aro.org, amitk@...nel.org,
rui.zhang@...el.com, linux-kernel@...r.kernel.org, megi@....cz,
Roman Stratiienko <r.stratiienko@...il.com>
Subject: [RFC] thermal/core: Disable uevent messages for cooling devices
During suspend, the big CPU cluster is turned off first while a little
is still running. This forcibly unregisters the cooling device which
sends a "REMOVE" uevent to all subscribers [1].
In case userspace netlink subscriber has set the EPOLLWAKEUP flag, a
wakeup event is triggered that causes suspend to be aborted.
Without this change, suspend doesn't work on PinePhone PRO with AOSP
userland.
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c238a8b599f1ae25eaeb08ad0e9e13e2b9eb023
Signed-off-by: Roman Stratiienko <r.stratiienko@...il.com>
---
drivers/thermal/thermal_core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index cdc0552e8c42e..e6b21f2792a85 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -925,6 +925,7 @@ __thermal_cooling_device_register(struct device_node *np,
cdev->device.class = &thermal_class;
cdev->devdata = devdata;
thermal_cooling_device_setup_sysfs(cdev);
+ dev_set_uevent_suppress(&cdev->device, true);
ret = device_register(&cdev->device);
if (ret)
goto out_kfree_type;
--
2.34.1
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