From: Julia Lawall <julia@xxxxxxx> The successive calls to clk_get each call clk_put in the case of failure, but this is not done for subsequent error handling code. The calls to clk_get are moved to the end of the function, and appropriate gotos are added. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r exists@ expression e1,e2; statement S; @@ e1 = clk_get@p1(...); ... when != e1 = e2 when != clk_put(e1) when any if (...) { ... when != clk_put(e1) when != if (...) { ... clk_put(e1) ... } * return@p3 ...; } else S // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- arch/arm/mach-s5pv210/cpufreq.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/arch/arm/mach-s5pv210/cpufreq.c b/arch/arm/mach-s5pv210/cpufreq.c index 22046e2..97a29e1 100644 --- a/arch/arm/mach-s5pv210/cpufreq.c +++ b/arch/arm/mach-s5pv210/cpufreq.c @@ -414,6 +414,7 @@ static int check_mem_type(void __iomem *dmc_reg) static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) { unsigned long mem_type; + int ret; cpu_clk = clk_get(NULL, "armclk"); if (IS_ERR(cpu_clk)) @@ -421,19 +422,20 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) dmc0_clk = clk_get(NULL, "sclk_dmc0"); if (IS_ERR(dmc0_clk)) { - clk_put(cpu_clk); - return PTR_ERR(dmc0_clk); + ret = PTR_ERR(dmc0_clk); + goto out_dmc0; } dmc1_clk = clk_get(NULL, "hclk_msys"); if (IS_ERR(dmc1_clk)) { - clk_put(dmc0_clk); - clk_put(cpu_clk); - return PTR_ERR(dmc1_clk); + ret = PTR_ERR(dmc1_clk); + goto out_dmc1; } - if (policy->cpu != 0) - return -EINVAL; + if (policy->cpu != 0) { + ret = -EINVAL; + goto out_dmc1; + } /* * check_mem_type : This driver only support LPDDR & LPDDR2. @@ -443,7 +445,8 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) if ((mem_type != LPDDR) && (mem_type != LPDDR2)) { printk(KERN_ERR "CPUFreq doesn't support this memory type\n"); - return -EINVAL; + ret = -EINVAL; + goto out_dmc1; } /* Find current refresh counter and frequency each DMC */ @@ -460,6 +463,12 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy) policy->cpuinfo.transition_latency = 40000; return cpufreq_frequency_table_cpuinfo(policy, s5pv210_freq_table); + +out_dmc1: + clk_put(dmc0_clk); +out_dmc0: + clk_put(cpu_clk); + return ret; } static struct cpufreq_driver s5pv210_driver = { -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
