oprofile, x86: fix init_sysfs error handling

On failure init_sysfs() might not properly free resources. The error
code of the function is not checked. And, when reinitializing the exit
function might be called twice. This patch fixes all this.

Cc: stable@kernel.org
Signed-off-by: Robert Richter <robert.richter@amd.com>

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index f6b48f6c595176a59c8e2fe5fa145bc11acca118..73a41d3c6c0911592f8e68e9dee8cdb4bf86400f 100644 (file)
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -568,8 +568,13 @@ static int __init init_sysfs(void)
        int error;
 
        error = sysdev_class_register(&oprofile_sysclass);
-       if (!error)
-               error = sysdev_register(&device_oprofile);
+       if (error)
+               return error;
+
+       error = sysdev_register(&device_oprofile);
+       if (error)
+               sysdev_class_unregister(&oprofile_sysclass);
+
        return error;
 }
 
@@ -695,6 +700,8 @@ int __init op_nmi_init(struct oprofile_operations *ops)
        char *cpu_type = NULL;
        int ret = 0;
 
+       using_nmi = 0;
+
        if (!cpu_has_apic)
                return -ENODEV;
 
@@ -774,7 +781,10 @@ int __init op_nmi_init(struct oprofile_operations *ops)
 
        mux_init(ops);
 
-       init_sysfs();
+       ret = init_sysfs();
+       if (ret)
+               return ret;
+
        using_nmi = 1;
        printk(KERN_INFO "oprofile: using NMI interrupt.\n");
        return 0;