This is a note to let you know that I've just added the patch titled PM: runtime: Do not call __rpm_callback() from rpm_idle() to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pm-runtime-do-not-call-__rpm_callback-from-rpm_idle.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit fffbf934d9a219974d95a7aa1c3883218c19a9a3 Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Date: Fri Dec 2 15:30:28 2022 +0100 PM: runtime: Do not call __rpm_callback() from rpm_idle() [ Upstream commit bc80c2e438dcbfcf748452ec0f7ad5b79ff3ad88 ] Calling __rpm_callback() from rpm_idle() after adding device links support to the former is a clear mistake. Not only it causes rpm_idle() to carry out unnecessary actions, but it is also against the assumption regarding the stability of PM-runtime status across __rpm_callback() invocations, because rpm_suspend() and rpm_resume() may run in parallel with __rpm_callback() when it is called by rpm_idle() and the device's PM-runtime status can be updated by any of them. Fixes: 21d5c57b3726 ("PM / runtime: Use device links") Link: https://lore.kernel.org/linux-pm/36aed941-a73e-d937-2721-4f0decd61ce0@xxxxxxxxxxx Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index b52049098d4e..14088b5adb55 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -484,7 +484,17 @@ static int rpm_idle(struct device *dev, int rpmflags) dev->power.idle_notification = true; - retval = __rpm_callback(callback, dev); + if (dev->power.irq_safe) + spin_unlock(&dev->power.lock); + else + spin_unlock_irq(&dev->power.lock); + + retval = callback(dev); + + if (dev->power.irq_safe) + spin_lock(&dev->power.lock); + else + spin_lock_irq(&dev->power.lock); dev->power.idle_notification = false; wake_up_all(&dev->power.wait_queue);