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

[Geert Uytterhoeven <geert+renesas@glider.be>]

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@glider.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