[1/4] oprofile: Handle initialisation failure more gracefully

Commit Message

Will Deacon Aug. 27, 2010, 3:15 p.m. UTC

None

Patch

diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c
index 0691176..12253eb 100644
--- a/arch/arm/oprofile/common.c
+++ b/arch/arm/oprofile/common.c
@@ -275,10 +275,12 @@  out:
 	return ret;
 }
 
-static void  exit_driverfs(void)
+static void __exit exit_driverfs(void)
 {
-	platform_device_unregister(oprofile_pdev);
-	platform_driver_unregister(&oprofile_driver);
+	if (!IS_ERR_OR_NULL(oprofile_pdev)) {
+		platform_device_unregister(oprofile_pdev);
+		platform_driver_unregister(&oprofile_driver);
+	}
 }
 #else
 static int __init init_driverfs(void) { return 0; }
@@ -365,6 +367,7 @@  int __init oprofile_arch_init(struct
oprofile_operations *ops)
 	ret = init_driverfs();
 	if (ret) {
 		kfree(counter_config);
+		counter_config = NULL;
 		return ret;
 	}
 
@@ -374,8 +377,10 @@  int __init oprofile_arch_init(struct
oprofile_operations *ops)
 		if (!perf_events[cpu]) {
 			pr_info("oprofile: failed to allocate %d perf events "
 					"for cpu %d\n", perf_num_counters, cpu);
-			while (--cpu >= 0)
+			while (--cpu >= 0) {
 				kfree(perf_events[cpu]);
+				perf_events[cpu] = NULL;
+			}
 			return -ENOMEM;
 		}
 	}
@@ -396,25 +401,27 @@  int __init oprofile_arch_init(struct
oprofile_operations *ops)
 	return ret;
 }
 
-void oprofile_arch_exit(void)
+void __exit oprofile_arch_exit(void)
 {
 	int cpu, id;
 	struct perf_event *event;
 
-	if (*perf_events) {
-		exit_driverfs();
-		for_each_possible_cpu(cpu) {
-			for (id = 0; id < perf_num_counters; ++id) {
-				event = perf_events[cpu][id];
-				if (event != NULL)
-					perf_event_release_kernel(event);
-			}
-			kfree(perf_events[cpu]);
+	exit_driverfs();
+
+	for_each_possible_cpu(cpu) {
+		if (!perf_events[cpu])
+			continue;
+
+		for (id = 0; id < perf_num_counters; ++id) {
+			event = perf_events[cpu][id];
+			if (event != NULL)
+				perf_event_release_kernel(event);
 		}
+
+		kfree(perf_events[cpu]);
 	}
 
-	if (counter_config)
-		kfree(counter_config);
+	kfree(counter_config);
 }
 #else
 int __init oprofile_arch_init(struct oprofile_operations *ops)
@@ -422,5 +429,5 @@  int __init oprofile_arch_init(struct
oprofile_operations *ops)
 	pr_info("oprofile: hardware counters not available\n");
 	return -ENODEV;
 }
-void oprofile_arch_exit(void) {}
+void __exit oprofile_arch_exit(void) {}
 #endif /* CONFIG_HW_PERF_EVENTS */
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index b336cd9..3094af0 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -257,15 +257,11 @@  static int __init oprofile_init(void)
 		printk(KERN_INFO "oprofile: using timer interrupt.\n");
 		err = oprofile_timer_init(&oprofile_ops);
 		if (err)
-			goto out_arch;
+			goto out;
 	}
 	err = oprofilefs_register();
-	if (err)
-		goto out_arch;
-	return 0;
 
-out_arch:
-	oprofile_arch_exit();
+out:
 	return err;
 }