linux-kernel - [PATCH 3/3] cpufreq: ppc: Fix handling of non-existent clocks

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Message-Id: <1397728407-13909-3-git-send-email-geert+renesas@glider.be>
Date:	Thu, 17 Apr 2014 11:53:27 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 3/3] cpufreq: ppc: Fix handling of non-existent clocks

If the clock doesn't exist, clk_get_rate() returns -EINVAL, which becomes
a large number (freq is u32), failing the "freq < min_cpufreq" test.
Explicitly test for "(u32)-EINVAL" to fix this.

Update the comment, and fix a grammer issue while we're at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/cpufreq/ppc-corenet-cpufreq.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/ppc-corenet-cpufreq.c b/drivers/cpufreq/ppc-corenet-cpufreq.c
index 53881d78a931..7027eab814ce 100644
--- a/drivers/cpufreq/ppc-corenet-cpufreq.c
+++ b/drivers/cpufreq/ppc-corenet-cpufreq.c
@@ -179,10 +179,11 @@ static int corenet_cpufreq_cpu_init(struct cpufreq_policy *policy)
 		clk = of_clk_get(data->parent, i);
 		freq = clk_get_rate(clk);
 		/*
-		 * the clock is valid if its frequency is not masked
-		 * and large than minimum allowed frequency.
+		 * the clock is valid if it exists, its frequency is not
+		 * masked, and larger than minimum allowed frequency.
 		 */
-		if (freq < min_cpufreq || (mask & (1 << i)))
+		if (freq == (u32)-EINVAL || freq < min_cpufreq ||
+		    (mask & (1 << i)))
 			table[i].frequency = CPUFREQ_ENTRY_INVALID;
 		else
 			table[i].frequency = freq / 1000;
-- 
1.7.9.5

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