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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2016-12-07 16:22:18 +0100
committerSekhar Nori <nsekhar@ti.com>2017-01-02 15:02:51 +0530
commitb40881738f098e1be5c32e89c2691b688fc00875 (patch)
treec69b1eda11d056fe71cea569a95ba0c132cd12fd /arch
parent0a5011673af0fe995a3e448d3479a027a4082ddf (diff)
ARM: davinci: da850: fix da850_set_pll0rate()
This function is confusing - its second argument is an index to the freq table, not the requested clock rate in Hz, but it's used as the set_rate callback for the pll0 clock. It leads to an oops when the caller doesn't know the internals and passes the rate in Hz as argument instead of the cpufreq index since this argument isn't bounds checked either. Fix it by iterating over the array of supported frequencies and selecting a one that matches or returning -EINVAL for unsupported rates. Also: update the davinci cpufreq driver. It's the only user of this clock and currently it passes the cpufreq table index to clk_set_rate(), which is confusing. Make it pass the requested clock rate in Hz. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> [nsekhar@ti.com: commit headline update] Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-davinci/da850.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 063560d75b22..07d36fc1e33c 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -1174,14 +1174,28 @@ static int da850_set_armrate(struct clk *clk, unsigned long index)
return clk_set_rate(pllclk, index);
}
-static int da850_set_pll0rate(struct clk *clk, unsigned long index)
+static int da850_set_pll0rate(struct clk *clk, unsigned long rate)
{
- unsigned int prediv, mult, postdiv;
- struct da850_opp *opp;
struct pll_data *pll = clk->pll_data;
+ struct cpufreq_frequency_table *freq;
+ unsigned int prediv, mult, postdiv;
+ struct da850_opp *opp = NULL;
int ret;
- opp = (struct da850_opp *) cpufreq_info.freq_table[index].driver_data;
+ rate /= 1000;
+
+ for (freq = da850_freq_table;
+ freq->frequency != CPUFREQ_TABLE_END; freq++) {
+ /* rate is in Hz, freq->frequency is in KHz */
+ if (freq->frequency == rate) {
+ opp = (struct da850_opp *)freq->driver_data;
+ break;
+ }
+ }
+
+ if (!opp)
+ return -EINVAL;
+
prediv = opp->prediv;
mult = opp->mult;
postdiv = opp->postdiv;