[CPUFREQ] s5pv210-cpufreq.c: Add missing clk_put

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 <[email protected]> Signed-off-by: Kukjin Kim <[email protected]> Signed-off-by: Dave Jones <[email protected]>
yshchan · Jul 13, 2011 · 4911ca1 · 4911ca1
1 parent 15964d3
commit 4911ca1
Showing 1 changed file with 17 additions and 8 deletions.
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -415,26 +415,28 @@ 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))
 		return PTR_ERR(cpu_clk);
 
 	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.
@@ -444,7 +446,8 @@ 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 */
@@ -461,6 +464,12 @@ 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 = {