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

[Sudeep Holla]

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 at poczta.onet.pl>
Cc: Neil Armstrong <narmstrong at baylibre.com>
Cc: Michael Turquette <mturquette at baylibre.com>
Cc: Stephen Boyd <sboyd at codeaurora.org>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 drivers/clk/clk-scpi.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk-scpi.c b/drivers/clk/clk-scpi.c
index 2a3e9d8e88b0..96d37175d0ad 100644
--- a/drivers/clk/clk-scpi.c
+++ b/drivers/clk/clk-scpi.c
@@ -290,13 +290,15 @@ static int scpi_clocks_probe(struct platform_device *pdev)
 			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;
 }
 
-- 
2.7.4