[PATCH] cpufreq: omap: clk_round_rate() can return a zero uponerror

From: Paul Walmsley
Date: Mon Dec 09 2013 - 21:18:29 EST



Treat both negative and zero return values from clk_round_rate() as errors. This is needed since subsequent patches will convert clk_round_rate()'s return value to be an unsigned type, rather than a signed type, since some clock sources can generate rates higher than (2^31)-1 Hz.

Eventually, when calling clk_round_rate(), only a return value of
zero will be considered a error. All other values will be
considered valid rates. The comparison against values less than
0 is kept to preserve the correct behavior in the meantime.

This patch also removes a bogus usage of IS_ERR_VALUE(), which is intended to be used only on combination pointer/error code return values; a side-benefit.

Signed-off-by: Paul Walmsley <pwalmsley@xxxxxxxxxx>
Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
Applies on v3.13-rc3. See also:

http://marc.info/?l=linux-arm-kernel&m=138542591313620&w=2

drivers/cpufreq/omap-cpufreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index a0acd0bfba40..0f41eb2609f3 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -63,7 +63,7 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int index)

freq = new_freq * 1000;
ret = clk_round_rate(mpu_clk, freq);
- if (IS_ERR_VALUE(ret)) {
+ if (ret <= 0) {
dev_warn(mpu_dev,
"CPUfreq: Cannot find matching frequency for %lu\n",
freq);
--
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