[v3] ARM: rockchip: fix a leaked reference by adding missing of_node_put
diff mbox series

Message ID 1556262488-21072-1-git-send-email-wen.yang99@zte.com.cn
State New
Headers show
Series
  • [v3] ARM: rockchip: fix a leaked reference by adding missing of_node_put
Related show

Commit Message

Wen Yang April 26, 2019, 7:08 a.m. UTC
The call to of_get_next_child returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./arch/arm/mach-rockchip/pm.c:269:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/pm.c:275:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function
./arch/arm/mach-rockchip/platsmp.c:281:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:285:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:289:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:303:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 294, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Suggested-by: Heiko Stuebner <heiko@sntech.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
v2: add a missing space between "adding" and "missing"
v3: just add a regular of_node_put 

 arch/arm/mach-rockchip/platsmp.c | 12 ++++++++++--
 arch/arm/mach-rockchip/pm.c      |  2 ++
 2 files changed, 12 insertions(+), 2 deletions(-)

Comments

Markus Elfring April 28, 2019, 6:27 a.m. UTC | #1
>  arch/arm/mach-rockchip/platsmp.c | 12 ++++++++++--
>  arch/arm/mach-rockchip/pm.c      |  2 ++

* Would a commit subject variant be nicer?

* I dare to present a reminder for a recurring development topic.
  How do you think about to adjust the exception handling in these function
  implementations a bit more according to the Linux coding style
  (so that the addition of duplicate function calls would be avoided)?

Regards,
Markus
Heiko Stuebner April 28, 2019, 10:40 a.m. UTC | #2
Am Sonntag, 28. April 2019, 08:27:05 CEST schrieb Markus Elfring:
> >  arch/arm/mach-rockchip/platsmp.c | 12 ++++++++++--
> >  arch/arm/mach-rockchip/pm.c      |  2 ++
> 
> * Would a commit subject variant be nicer?

yeah, but I'll simply adjust that when applying.

> * I dare to present a reminder for a recurring development topic.
>   How do you think about to adjust the exception handling in these function
>   implementations a bit more according to the Linux coding style
>   (so that the addition of duplicate function calls would be avoided)?

I actually requested not doing wild gotos for of_node_put calls,
as it makes the code harder to read, especially when the "node"
gets reused for a different node-source.
Heiko Stuebner April 28, 2019, 10:46 a.m. UTC | #3
Am Freitag, 26. April 2019, 09:08:08 CEST schrieb Wen Yang:
> The call to of_get_next_child returns a node pointer with refcount
> incremented thus it must be explicitly decremented after the last
> usage.
> 
> Detected by coccinelle with the following warnings:
> ./arch/arm/mach-rockchip/pm.c:269:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function.
> ./arch/arm/mach-rockchip/pm.c:275:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function
> ./arch/arm/mach-rockchip/platsmp.c:281:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
> ./arch/arm/mach-rockchip/platsmp.c:285:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
> ./arch/arm/mach-rockchip/platsmp.c:289:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 272, but without a corresponding object release within this function.
> ./arch/arm/mach-rockchip/platsmp.c:303:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 294, but without a corresponding object release within this function.
> 
> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> Suggested-by: Heiko Stuebner <heiko@sntech.de>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Heiko Stuebner <heiko@sntech.de>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-rockchip@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org

queued for 5.3 (too late for 5.2)

Thanks
Heiko
Markus Elfring April 28, 2019, 10:52 a.m. UTC | #4
>>   How do you think about to adjust the exception handling in these function
>>   implementations a bit more according to the Linux coding style
>>   (so that the addition of duplicate function calls would be avoided)?
>
> I actually requested not doing wild gotos for of_node_put calls,
> as it makes the code harder to read, especially when the "node"
> gets reused for a different node-source.

Does this feedback mean that you insist on another deviation
from the Linux coding style?

Regards,
Markus

Patch
diff mbox series

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 4675d92..afd1514 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -278,19 +278,25 @@  static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 	sram_base_addr = of_iomap(node, 0);
 	if (!sram_base_addr) {
 		pr_err("%s: could not map sram registers\n", __func__);
+		of_node_put(node);
 		return;
 	}
 
-	if (has_pmu && rockchip_smp_prepare_pmu())
+	if (has_pmu && rockchip_smp_prepare_pmu()) {
+		of_node_put(node);
 		return;
+	}
 
 	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
-		if (rockchip_smp_prepare_sram(node))
+		if (rockchip_smp_prepare_sram(node)) {
+			of_node_put(node);
 			return;
+		}
 
 		/* enable the SCU power domain */
 		pmu_set_power_domain(PMU_PWRDN_SCU, true);
 
+		of_node_put(node);
 		node = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
 		if (!node) {
 			pr_err("%s: missing scu\n", __func__);
@@ -300,6 +306,7 @@  static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 		scu_base_addr = of_iomap(node, 0);
 		if (!scu_base_addr) {
 			pr_err("%s: could not map scu registers\n", __func__);
+			of_node_put(node);
 			return;
 		}
 
@@ -318,6 +325,7 @@  static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 		asm ("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
 		ncores = ((l2ctlr >> 24) & 0x3) + 1;
 	}
+	of_node_put(node);
 
 	/* Make sure that all cores except the first are really off */
 	for (i = 1; i < ncores; i++)
diff --git a/arch/arm/mach-rockchip/pm.c b/arch/arm/mach-rockchip/pm.c
index 065b09e..4a4f914 100644
--- a/arch/arm/mach-rockchip/pm.c
+++ b/arch/arm/mach-rockchip/pm.c
@@ -266,12 +266,14 @@  static int __init rk3288_suspend_init(struct device_node *np)
 	rk3288_bootram_base = of_iomap(sram_np, 0);
 	if (!rk3288_bootram_base) {
 		pr_err("%s: could not map bootram base\n", __func__);
+		of_node_put(sram_np);
 		return -ENOMEM;
 	}
 
 	ret = of_address_to_resource(sram_np, 0, &res);
 	if (ret) {
 		pr_err("%s: could not get bootram phy addr\n", __func__);
+		of_node_put(sram_np);
 		return ret;
 	}
 	rk3288_bootram_phy = res.start;