The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 928265e3601cde78c7e0a3e518a93b27defed3b1 Mon Sep 17 00:00:00 2001

From: "Rafael J. Wysocki" rafael.j.wysocki@intel.com Date: Fri, 22 Oct 2021 14:58:23 +0200 Subject: [PATCH] PM: sleep: Do not let "syscore" devices runtime-suspend during system transitions

There is no reason to allow "syscore" devices to runtime-suspend during system-wide PM transitions, because they are subject to the same possible failure modes as any other devices in that respect.

Accordingly, change device_prepare() and device_complete() to call pm_runtime_get_noresume() and pm_runtime_put(), respectively, for "syscore" devices too.

Fixes: 057d51a1268f ("Merge branch 'pm-sleep'") Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Cc: 3.10+ stable@vger.kernel.org # 3.10+ Reviewed-by: Ulf Hansson ulf.hansson@linaro.org

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index cbea78e79f3d..fca6eab871fc 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1051,7 +1051,7 @@ static void device_complete(struct device *dev, pm_message_t state) const char *info = NULL;

if (dev->power.syscore) - return; + goto out;

device_lock(dev);

@@ -1081,6 +1081,7 @@ static void device_complete(struct device *dev, pm_message_t state)

device_unlock(dev);

+out: pm_runtime_put(dev); }

@@ -1794,9 +1795,6 @@ static int device_prepare(struct device *dev, pm_message_t state) int (*callback)(struct device *) = NULL; int ret = 0;

- if (dev->power.syscore) - return 0; - /* * If a device's parent goes into runtime suspend at the wrong time, * it won't be possible to resume the device. To prevent this we @@ -1805,6 +1803,9 @@ static int device_prepare(struct device *dev, pm_message_t state) */ pm_runtime_get_noresume(dev);

+ if (dev->power.syscore) + return 0; + device_lock(dev);

dev->power.wakeup_path = false;