oprofile, ARM: Use oprofile_arch_exit() to cleanup on failure

There is duplicate cleanup code in the init and exit functions. Now,
oprofile_arch_exit() is also used if oprofile_arch_init() fails.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>

drivers/oprofile/oprofile_perf.c

@@ -245,10 +245,33 @@ static int __init init_driverfs(void) { return 0; }
 #define exit_driverfs() do { } while (0)
 #endif /* CONFIG_PM */
 
+void oprofile_perf_exit(void)
+{
+	int cpu, id;
+	struct perf_event *event;
+
+	for_each_possible_cpu(cpu) {
+		for (id = 0; id < num_counters; ++id) {
+			event = perf_events[cpu][id];
+			if (event)
+				perf_event_release_kernel(event);
+		}
+
+		kfree(perf_events[cpu]);
+	}
+
+	kfree(counter_config);
+	exit_driverfs();
+}
+
 int __init oprofile_perf_init(struct oprofile_operations *ops)
 {
 	int cpu, ret = 0;
 
+	ret = init_driverfs();
+	if (ret)
+		return ret;
+
 	memset(&perf_events, 0, sizeof(perf_events));
 
 	num_counters = perf_num_counters();
@@ -265,13 +288,10 @@ int __init oprofile_perf_init(struct oprofile_operations *ops)
 		pr_info("oprofile: failed to allocate %d "
 				"counters\n", num_counters);
 		ret = -ENOMEM;
+		num_counters = 0;
 		goto out;
 	}
 
-	ret = init_driverfs();
-	if (ret)
-		goto out;
-
 	for_each_possible_cpu(cpu) {
 		perf_events[cpu] = kcalloc(num_counters,
 				sizeof(struct perf_event *), GFP_KERNEL);
@@ -296,30 +316,8 @@ int __init oprofile_perf_init(struct oprofile_operations *ops)
 		pr_info("oprofile: using %s\n", ops->cpu_type);
 
 out:
-	if (ret) {
-		for_each_possible_cpu(cpu)
-			kfree(perf_events[cpu]);
-		kfree(counter_config);
-	}
+	if (ret)
+		oprofile_perf_exit();
 
 	return ret;
 }
-
-void __exit oprofile_perf_exit(void)
-{
-	int cpu, id;
-	struct perf_event *event;
-
-	for_each_possible_cpu(cpu) {
-		for (id = 0; id < num_counters; ++id) {
-			event = perf_events[cpu][id];
-			if (event)
-				perf_event_release_kernel(event);
-		}
-
-		kfree(perf_events[cpu]);
-	}
-
-	kfree(counter_config);
-	exit_driverfs();
-}