Patch "cpufreq: cpufreq_register_driver() should return -ENODEV if init fails" has been added to the 4.4-stable tree

Patch "cpufreq: cpufreq_register_driver() should return -ENODEV if init fails" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    cpufreq: cpufreq_register_driver() should return -ENODEV if init fails

to the 4.4-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:
     cpufreq-cpufreq_register_driver-should-return-enodev-if-init-fails.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6c77003677d5f1ce15f26d24360cb66c0bc07bb3 Mon Sep 17 00:00:00 2001
From: David Arcari <darcari@redhat.com>
Date: Fri, 26 May 2017 11:37:31 -0400
Subject: cpufreq: cpufreq_register_driver() should return -ENODEV if init fails

From: David Arcari <darcari@redhat.com>

commit 6c77003677d5f1ce15f26d24360cb66c0bc07bb3 upstream.

For a driver that does not set the CPUFREQ_STICKY flag, if all of the
->init() calls fail, cpufreq_register_driver() should return an error.
This will prevent the driver from loading.

Fixes: ce1bcfe94db8 (cpufreq: check cpufreq_policy_list instead of scanning policies for all CPUs)
Signed-off-by: David Arcari <darcari@redhat.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/cpufreq/cpufreq.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2451,6 +2451,7 @@ int cpufreq_register_driver(struct cpufr
 	if (!(cpufreq_driver->flags & CPUFREQ_STICKY) &&
 	    list_empty(&cpufreq_policy_list)) {
 		/* if all ->init() calls failed, unregister */
+		ret = -ENODEV;
 		pr_debug("%s: No CPU initialized for driver %s\n", __func__,
 			 driver_data->name);
 		goto err_if_unreg;


Patches currently in stable-queue which might be from darcari@redhat.com are

queue-4.4/cpufreq-cpufreq_register_driver-should-return-enodev-if-init-fails.patch