---

yaml
---
r: 167463
b: refs/heads/master
c: c086893
h: refs/heads/master
i:
  167461: e969431
  167459: b82c8c1
  167455: 2964524
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 066b3aa8454bee3cdc665d86b5de812d8d0513b3
+refs/heads/master: c0868934e536e0ff508f2d359d006b25abc4970d

trunk/drivers/oprofile/event_buffer.c

@@ -35,17 +35,22 @@ static size_t buffer_pos;
 /* atomic_t because wait_event checks it outside of buffer_mutex */
 static atomic_t buffer_ready = ATOMIC_INIT(0);
 
-/* Add an entry to the event buffer. When we
- * get near to the end we wake up the process
- * sleeping on the read() of the file.
+/*
+ * Add an entry to the event buffer. When we get near to the end we
+ * wake up the process sleeping on the read() of the file. To protect
+ * the event_buffer this function may only be called when buffer_mutex
+ * is set.
  */
 void add_event_entry(unsigned long value)
 {
 	/*
-	 * catch potential error
+	 * This shouldn't happen since all workqueues or handlers are
+	 * canceled or flushed before the event buffer is freed.
 	 */
-	if (!event_buffer)
+	if (!event_buffer) {
+		WARN_ON_ONCE(1);
 		return;
+	}
 
 	if (buffer_pos == buffer_size) {
 		atomic_inc(&oprofile_stats.event_lost_overflow);
@@ -75,7 +80,6 @@ void wake_up_buffer_waiter(void)
 
 int alloc_event_buffer(void)
 {
-	int err = -ENOMEM;
 	unsigned long flags;
 
 	spin_lock_irqsave(&oprofilefs_lock, flags);
@@ -86,20 +90,20 @@ int alloc_event_buffer(void)
 	if (buffer_watershed >= buffer_size)
 		return -EINVAL;
 
+	buffer_pos = 0;
 	event_buffer = vmalloc(sizeof(unsigned long) * buffer_size);
 	if (!event_buffer)
-		goto out;
+		return -ENOMEM;
 
-	err = 0;
-out:
-	return err;
+	return 0;
 }
 
 
 void free_event_buffer(void)
 {
 	mutex_lock(&buffer_mutex);
 	vfree(event_buffer);
+	buffer_pos = 0;
 	event_buffer = NULL;
 	mutex_unlock(&buffer_mutex);
 }
@@ -174,6 +178,7 @@ static ssize_t event_buffer_read(struct file *file, char __user *buf,
 
 	mutex_lock(&buffer_mutex);
 
+	/* May happen if the buffer is freed during pending reads. */
 	if (!event_buffer) {
 		retval = -EINTR;
 		goto out;