3 files changed, 20 insertions, 29 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1dc101d09765..e51a1bcb7bed 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2199,15 +2199,15 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
 		ret = ftrace_process_regex(parser->buffer,
 					   parser->idx, enable);
 		if (ret)
-			goto out;
+			goto out_unlock;
 
 		trace_parser_clear(parser);
 	}
 
 	ret = read;
-
+out_unlock:
 	mutex_unlock(&ftrace_regex_lock);
-out:
+
 	return ret;
 }
 
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 4b8293fa545e..a72c6e03deec 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1193,6 +1193,7 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
 	atomic_inc(&cpu_buffer->record_disabled);
 	synchronize_sched();
 
+	spin_lock_irq(&cpu_buffer->reader_lock);
 	rb_head_page_deactivate(cpu_buffer);
 
 	for (i = 0; i < nr_pages; i++) {
@@ -1207,6 +1208,7 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
 		return;
 
 	rb_reset_cpu(cpu_buffer);
+	spin_unlock_irq(&cpu_buffer->reader_lock);
 
 	rb_check_pages(cpu_buffer);
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9d3067a62d43..874f2893cff0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1361,10 +1361,11 @@ int trace_array_vprintk(struct trace_array *tr,
 	pause_graph_tracing();
 	raw_local_irq_save(irq_flags);
 	__raw_spin_lock(&trace_buf_lock);
-	len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
-
-	len = min(len, TRACE_BUF_SIZE-1);
-	trace_buf[len] = 0;
+	if (args == NULL) {
+		strncpy(trace_buf, fmt, TRACE_BUF_SIZE);
+		len = strlen(trace_buf);
+	} else
+		len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
 
 	size = sizeof(*entry) + len + 1;
 	buffer = tr->buffer;
@@ -1373,10 +1374,10 @@ int trace_array_vprintk(struct trace_array *tr,
 	if (!event)
 		goto out_unlock;
 	entry = ring_buffer_event_data(event);
-	entry->ip			= ip;
+	entry->ip = ip;
 
 	memcpy(&entry->buf, trace_buf, len);
-	entry->buf[len] = 0;
+	entry->buf[len] = '\0';
 	if (!filter_check_discard(call, entry, buffer, event))
 		ring_buffer_unlock_commit(buffer, event);
 
@@ -3319,22 +3320,11 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 	return cnt;
 }
 
-static int mark_printk(const char *fmt, ...)
-{
-	int ret;
-	va_list args;
-	va_start(args, fmt);
-	ret = trace_vprintk(0, fmt, args);
-	va_end(args);
-	return ret;
-}
-
 static ssize_t
 tracing_mark_write(struct file *filp, const char __user *ubuf,
 					size_t cnt, loff_t *fpos)
 {
 	char *buf;
-	char *end;
 
 	if (tracing_disabled)
 		return -EINVAL;
@@ -3342,7 +3332,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	if (cnt > TRACE_BUF_SIZE)
 		cnt = TRACE_BUF_SIZE;
 
-	buf = kmalloc(cnt + 1, GFP_KERNEL);
+	buf = kmalloc(cnt + 2, GFP_KERNEL);
 	if (buf == NULL)
 		return -ENOMEM;
 
@@ -3350,14 +3340,13 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 		kfree(buf);
 		return -EFAULT;
 	}
+	if (buf[cnt-1] != '\n') {
+		buf[cnt] = '\n';
+		buf[cnt+1] = '\0';
+	} else
+		buf[cnt] = '\0';
 
-	/* Cut from the first nil or newline. */
-	buf[cnt] = '\0';
-	end = strchr(buf, '\n');
-	if (end)
-		*end = '\0';
-
-	cnt = mark_printk("%s\n", buf);
+	cnt = trace_vprintk(0, buf, NULL);
 	kfree(buf);
 	*fpos += cnt;
 
@@ -3730,7 +3719,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
 
 	s = kmalloc(sizeof(*s), GFP_KERNEL);
 	if (!s)
-		return ENOMEM;
+		return -ENOMEM;
 
 	trace_seq_init(s);