From mboxrd@z Thu Jan 1 00:00:00 1970 From: bgolaszewski@baylibre.com (Bartosz Golaszewski) Date: Thu, 1 Dec 2016 18:15:16 +0100 Subject: [PATCH 3/3] ARM: da850: fix da850_set_pll0rate() In-Reply-To: <1480612516-18853-1-git-send-email-bgolaszewski@baylibre.com> References: <1480612516-18853-1-git-send-email-bgolaszewski@baylibre.com> Message-ID: <1480612516-18853-4-git-send-email-bgolaszewski@baylibre.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This function is broken - its second argument is an index to the freq table, not the requested clock rate in Hz. It leads to an oops when called from clk_set_rate() 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. Signed-off-by: Bartosz Golaszewski --- arch/arm/mach-davinci/da850.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c index 855b720..1c0f296 100644 --- a/arch/arm/mach-davinci/da850.c +++ b/arch/arm/mach-davinci/da850.c @@ -1173,14 +1173,28 @@ 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 requested_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; + for (freq = da850_freq_table; + freq->frequency != CPUFREQ_TABLE_END; freq++) { + /* requested_rate is in Hz, freq->frequency is in KHz */ + unsigned long freq_rate = freq->frequency * 1000; + + if (freq_rate == requested_rate) { + opp = (struct da850_opp *)freq->driver_data; + break; + } + } + + if (opp == NULL) + return -EINVAL; + prediv = opp->prediv; mult = opp->mult; postdiv = opp->postdiv; -- 2.9.3