arm/mach-at91/pm : fix possible object reference leak

of_find_device_by_node() takes a reference to the struct device
when it finds a match via get_device. When returning error we should
call put_device.

Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 51e808adb00cc23576b1f9148f0388542627d397..2a757dcaa1a5e9d63b5ae47833ef31d12ab94aa2 100644 (file)
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -591,13 +591,13 @@ static int __init at91_pm_backup_init(void)
 
        np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
        if (!np)
-               goto securam_fail;
+               goto securam_fail_no_ref_dev;
 
        pdev = of_find_device_by_node(np);
        of_node_put(np);
        if (!pdev) {
                pr_warn("%s: failed to find securam device!\n", __func__);
-               goto securam_fail;
+               goto securam_fail_no_ref_dev;
        }
 
        sram_pool = gen_pool_get(&pdev->dev, NULL);
@@ -620,6 +620,8 @@ static int __init at91_pm_backup_init(void)
        return 0;
 
 securam_fail:
+       put_device(&pdev->dev);
+securam_fail_no_ref_dev:
        iounmap(pm_data.sfrbu);
        pm_data.sfrbu = NULL;
        return ret;