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perf: Fix STATE_EXIT usage 

We should never attempt to enable a STATE_EXIT event.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Peter Zijlstra 2016-01-26 12:17:08 +01:00 committed by Ingo Molnar
parent 07c4a77613
commit 6e801e0169
1 changed files with 4 additions and 2 deletions
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6
kernel/events/core.c
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@ -2253,7 +2253,8 @@ static void __perf_event_enable(struct perf_event *event,
struct perf_event *leader = event->group_leader;
struct perf_event_context *task_ctx;
if (event->state >= PERF_EVENT_STATE_INACTIVE)
if (event->state >= PERF_EVENT_STATE_INACTIVE ||
event->state <= PERF_EVENT_STATE_ERROR)
return;
update_context_time(ctx);
@ -2298,7 +2299,8 @@ static void _perf_event_enable(struct perf_event *event)
struct perf_event_context *ctx = event->ctx;
raw_spin_lock_irq(&ctx->lock);
if (event->state >= PERF_EVENT_STATE_INACTIVE) {
if (event->state >= PERF_EVENT_STATE_INACTIVE ||
event->state < PERF_EVENT_STATE_ERROR) {
raw_spin_unlock_irq(&ctx->lock);
return;
}