PM: Block enabling of runtime PM during system suspend

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If device_prepare() runs on a device that has never had runtime
PM enabled so far, it may reasonably assume that runtime PM will
not be enabled for that device during the system suspend-resume
cycle currently in progress, but this has never been guaranteed.

To verify this assumption, make device_prepare() arrange for
triggering a device warning accompanied by a call trace dump if
runtime PM is enabled for such a device after it has returned.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/6131109.lOV4Wx5bFT@rjwysocki.net

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This commit is contained in:

Rafael J. Wysocki 2025-02-18 21:11:42 +01:00

parent 6146b94994

commit 3e5eee147b

4 changed files with 38 additions and 0 deletions

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9

drivers/base/power/main.c

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24

drivers/base/power/runtime.c

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1

include/linux/pm.h

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4

include/linux/pm_runtime.h

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