linux-kernel - [PATCH 5/10] arch/arm/mach-s5pv210/cpufreq.c: add missing clk

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed,  1 Jun 2011 19:10:08 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	kernel-janitors@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/10] arch/arm/mach-s5pv210/cpufreq.c: add missing clk_put

From: Julia Lawall <julia@...u.dk>

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@...u.dk>

---
 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 linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/