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tracing: Add error checks to creation of event files

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The creation of the set_event_pid file was assigned to a variable "entry"
but that variable was never used. Ideally, it should be used to check if the
file was created and warn if it was not.

The files header_page, header_event should also be checked and a warning if
they fail to be created.

The "enable" file was moved up, as it is a more crucial file to have and a
hard failure (return -ENOMEM) should be returned if it is not created.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2016-11-22 18:32:03 -05:00 committed by Steven Rostedt
parent 9dfed80d87
commit 7d43640022
1 changed files with 21 additions and 9 deletions
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30
kernel/trace/trace_events.c
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@ -2843,20 +2843,32 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
return -ENOMEM;
}
entry = trace_create_file("enable", 0644, d_events,
tr, &ftrace_tr_enable_fops);
if (!entry) {
pr_warn("Could not create tracefs 'enable' entry\n");
return -ENOMEM;
}
/* There are not as crucial, just warn if they are not created */
entry = tracefs_create_file("set_event_pid", 0644, parent,
tr, &ftrace_set_event_pid_fops);
if (!entry)
pr_warn("Could not create tracefs 'set_event_pid' entry\n");
/* ring buffer internal formats */
trace_create_file("header_page", 0444, d_events,
ring_buffer_print_page_header,
&ftrace_show_header_fops);
entry = trace_create_file("header_page", 0444, d_events,
ring_buffer_print_page_header,
&ftrace_show_header_fops);
if (!entry)
pr_warn("Could not create tracefs 'header_page' entry\n");
trace_create_file("header_event", 0444, d_events,
ring_buffer_print_entry_header,
&ftrace_show_header_fops);
trace_create_file("enable", 0644, d_events,
tr, &ftrace_tr_enable_fops);
entry = trace_create_file("header_event", 0444, d_events,
ring_buffer_print_entry_header,
&ftrace_show_header_fops);
if (!entry)
pr_warn("Could not create tracefs 'header_event' entry\n");
tr->event_dir = d_events;