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trace_events_filter: Use rcu_assign_pointer() when setting ftrace_event_call->filter

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commit d3d9acf646 upstream.

ftrace_event_call->filter is sched RCU protected but didn't use
rcu_assign_pointer().  Use it.

TODO: Add proper __rcu annotation to call->filter and all its users.

-v2: Use RCU_INIT_POINTER() for %NULL clearing as suggested by Eric.

Link: http://lkml.kernel.org/r/20111123164949.GA29639@google.com

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2011-11-23 08:49:49 -08:00 committed by Greg Kroah-Hartman
parent e006de470f
commit 4e3cd8129c
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/trace_events_filter.c
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@ -1766,7 +1766,7 @@ static int replace_system_preds(struct event_subsystem *system,
* replace the filter for the call.
*/
filter = call->filter;
call->filter = filter_item->filter;
rcu_assign_pointer(call->filter, filter_item->filter);
filter_item->filter = filter;
fail = false;
@ -1821,7 +1821,7 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
filter = call->filter;
if (!filter)
goto out_unlock;
call->filter = NULL;
RCU_INIT_POINTER(call->filter, NULL);
/* Make sure the filter is not being used */
synchronize_sched();
__free_filter(filter);
@ -1862,7 +1862,7 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
* string
*/
tmp = call->filter;
call->filter = filter;
rcu_assign_pointer(call->filter, filter);
if (tmp) {
/* Make sure the call is done with the filter */
synchronize_sched();