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Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c49
1 files changed, 31 insertions, 18 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 16f7038d1f4d..384ede311717 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1085,13 +1085,13 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
}
#endif /* CONFIG_TRACER_MAX_TRACE */
-static void wait_on_pipe(struct trace_iterator *iter)
+static int wait_on_pipe(struct trace_iterator *iter)
{
/* Iterators are static, they should be filled or empty */
if (trace_buffer_iter(iter, iter->cpu_file))
- return;
+ return 0;
- ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file);
+ return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file);
}
#ifdef CONFIG_FTRACE_STARTUP_TEST
@@ -1338,7 +1338,7 @@ static int trace_create_savedcmd(void)
{
int ret;
- savedcmd = kmalloc(sizeof(struct saved_cmdlines_buffer), GFP_KERNEL);
+ savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL);
if (!savedcmd)
return -ENOMEM;
@@ -3840,7 +3840,7 @@ tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf,
int r;
arch_spin_lock(&trace_cmdline_lock);
- r = sprintf(buf, "%u\n", savedcmd->cmdline_num);
+ r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num);
arch_spin_unlock(&trace_cmdline_lock);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
@@ -3857,7 +3857,7 @@ static int tracing_resize_saved_cmdlines(unsigned int val)
{
struct saved_cmdlines_buffer *s, *savedcmd_temp;
- s = kmalloc(sizeof(struct saved_cmdlines_buffer), GFP_KERNEL);
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
@@ -4378,6 +4378,7 @@ tracing_poll_pipe(struct file *filp, poll_table *poll_table)
static int tracing_wait_pipe(struct file *filp)
{
struct trace_iterator *iter = filp->private_data;
+ int ret;
while (trace_empty(iter)) {
@@ -4399,10 +4400,13 @@ static int tracing_wait_pipe(struct file *filp)
mutex_unlock(&iter->mutex);
- wait_on_pipe(iter);
+ ret = wait_on_pipe(iter);
mutex_lock(&iter->mutex);
+ if (ret)
+ return ret;
+
if (signal_pending(current))
return -EINTR;
}
@@ -5327,8 +5331,12 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
goto out_unlock;
}
mutex_unlock(&trace_types_lock);
- wait_on_pipe(iter);
+ ret = wait_on_pipe(iter);
mutex_lock(&trace_types_lock);
+ if (ret) {
+ size = ret;
+ goto out_unlock;
+ }
if (signal_pending(current)) {
size = -EINTR;
goto out_unlock;
@@ -5538,8 +5546,10 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
goto out;
}
mutex_unlock(&trace_types_lock);
- wait_on_pipe(iter);
+ ret = wait_on_pipe(iter);
mutex_lock(&trace_types_lock);
+ if (ret)
+ goto out;
if (signal_pending(current)) {
ret = -EINTR;
goto out;
@@ -6232,22 +6242,25 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
return 0;
}
+static void free_trace_buffer(struct trace_buffer *buf)
+{
+ if (buf->buffer) {
+ ring_buffer_free(buf->buffer);
+ buf->buffer = NULL;
+ free_percpu(buf->data);
+ buf->data = NULL;
+ }
+}
+
static void free_trace_buffers(struct trace_array *tr)
{
if (!tr)
return;
- if (tr->trace_buffer.buffer) {
- ring_buffer_free(tr->trace_buffer.buffer);
- tr->trace_buffer.buffer = NULL;
- free_percpu(tr->trace_buffer.data);
- }
+ free_trace_buffer(&tr->trace_buffer);
#ifdef CONFIG_TRACER_MAX_TRACE
- if (tr->max_buffer.buffer) {
- ring_buffer_free(tr->max_buffer.buffer);
- tr->max_buffer.buffer = NULL;
- }
+ free_trace_buffer(&tr->max_buffer);
#endif
}