This is a note to let you know that I've just added the patch titled
cpuidle: Indicate when a device has been unregistered
to the 3.14-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:
cpuidle-indicate-when-a-device-has-been-unregistered.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c998c07836f985b24361629dc98506ec7893e7a0 Mon Sep 17 00:00:00 2001
From: Dave Gerlach <d-gerlach@xxxxxx>
Date: Tue, 5 Apr 2016 14:05:38 -0500
Subject: cpuidle: Indicate when a device has been unregistered
From: Dave Gerlach <d-gerlach@xxxxxx>
commit c998c07836f985b24361629dc98506ec7893e7a0 upstream.
Currently the 'registered' member of the cpuidle_device struct is set
to 1 during cpuidle_register_device. In this same function there are
checks to see if the device is already registered to prevent duplicate
calls to register the device, but this value is never set to 0 even on
unregister of the device. Because of this, any attempt to call
cpuidle_register_device after a call to cpuidle_unregister_device will
fail which shouldn't be the case.
To prevent this, set registered to 0 when the device is unregistered.
Fixes: c878a52d3c7c (cpuidle: Check if device is already registered)
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
Acked-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpuidle/cpuidle.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -313,6 +313,8 @@ static void __cpuidle_unregister_device(
list_del(&dev->device_list);
per_cpu(cpuidle_devices, dev->cpu) = NULL;
module_put(drv->owner);
+
+ dev->registered = 0;
}
static void __cpuidle_device_init(struct cpuidle_device *dev)
Patches currently in stable-queue which might be from d-gerlach@xxxxxx are
queue-3.14/cpuidle-indicate-when-a-device-has-been-unregistered.patch
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