Patch "clk: scpi: don't add cpufreq device if the scpi dvfs node is disabled" has been added to the 4.9-stable tree

Patch "clk: scpi: don't add cpufreq device if the scpi dvfs node is disabled" has been added to the 4.9-stable tree

[gregkh]

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

    clk: scpi: don't add cpufreq device if the scpi dvfs node is disabled

to the 4.9-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:
     clk-scpi-don-t-add-cpufreq-device-if-the-scpi-dvfs-node-is-disabled.patch
and it can be found in the queue-4.9 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 67bcc2c5f1da8c5bb58e72354274ea5c59a3950a Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Fri, 6 Jan 2017 12:34:30 +0000
Subject: clk: scpi: don't add cpufreq device if the scpi dvfs node is disabled
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Sudeep Holla <sudeep.holla@arm.com>

commit 67bcc2c5f1da8c5bb58e72354274ea5c59a3950a upstream.

Currently we add the virtual cpufreq device unconditionally even when
the SCPI DVFS clock provider node is disabled. This will cause cpufreq
driver to throw errors when it gets initailised on boot/modprobe and
also when the CPUs are hot-plugged back in.

This patch fixes the issue by adding the virtual cpufreq device only if
the SCPI DVFS clock provider is available and registered.

Fixes: 9490f01e2471 ("clk: scpi: add support for cpufreq virtual device")
Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Michał Zegan <webczat_200@poczta.onet.pl>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/clk/clk-scpi.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/clk/clk-scpi.c
+++ b/drivers/clk/clk-scpi.c
@@ -290,13 +290,15 @@ static int scpi_clocks_probe(struct plat
 			of_node_put(child);
 			return ret;
 		}
-	}
-	/* Add the virtual cpufreq device */
-	cpufreq_dev = platform_device_register_simple("scpi-cpufreq",
-						      -1, NULL, 0);
-	if (IS_ERR(cpufreq_dev))
-		pr_warn("unable to register cpufreq device");
 
+		if (match->data != &scpi_dvfs_ops)
+			continue;
+		/* Add the virtual cpufreq device if it's DVFS clock provider */
+		cpufreq_dev = platform_device_register_simple("scpi-cpufreq",
+							      -1, NULL, 0);
+		if (IS_ERR(cpufreq_dev))
+			pr_warn("unable to register cpufreq device");
+	}
 	return 0;
 }
 


Patches currently in stable-queue which might be from sudeep.holla@arm.com are

queue-4.9/clk-scpi-don-t-add-cpufreq-device-if-the-scpi-dvfs-node-is-disabled.patch