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tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()

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tracing_buffers_open() is racy, the memory inode->i_private points
to can be already freed.

Change debugfs_create_file("trace_pipe_raw", data) caller to pass
"data = tr", tracing_buffers_open() can use tracing_get_cpu().

Change debugfs_create_file("snapshot_raw_fops", data) caller too,
this file uses tracing_buffers_open/release.

Link: http://lkml.kernel.org/r/20130723152600.GA23720@redhat.com

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Oleg Nesterov 2013-07-23 17:26:00 +02:00 committed by Steven Rostedt
parent 15544209cb
commit 46ef2be0d1
1 changed files with 4 additions and 5 deletions
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9
kernel/trace/trace.c
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@ -4949,8 +4949,7 @@ static const struct file_operations snapshot_raw_fops = {
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
struct trace_cpu *tc = inode->i_private;
struct trace_array *tr = tc->tr;
struct trace_array *tr = inode->i_private;
struct ftrace_buffer_info *info;
int ret;
@ -4969,7 +4968,7 @@ static int tracing_buffers_open(struct inode *inode, struct file *filp)
mutex_lock(&trace_types_lock);
info->iter.tr = tr;
info->iter.cpu_file = tc->cpu;
info->iter.cpu_file = tracing_get_cpu(inode);
info->iter.trace = tr->current_trace;
info->iter.trace_buffer = &tr->trace_buffer;
info->spare = NULL;
@ -5576,7 +5575,7 @@ tracing_init_debugfs_percpu(struct trace_array *tr, long cpu)
&data->trace_cpu, cpu, &tracing_fops);
trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
&data->trace_cpu, cpu, &tracing_buffers_fops);
tr, cpu, &tracing_buffers_fops);
trace_create_cpu_file("stats", 0444, d_cpu,
&data->trace_cpu, cpu, &tracing_stats_fops);
@ -5589,7 +5588,7 @@ tracing_init_debugfs_percpu(struct trace_array *tr, long cpu)
&data->trace_cpu, cpu, &snapshot_fops);
trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
&data->trace_cpu, cpu, &snapshot_raw_fops);
tr, cpu, &snapshot_raw_fops);
#endif
}