From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 26 Jan 2016 11:17:08 +0000 (+0100)
Subject: perf: Fix STATE_EXIT usage
X-Git-Tag: v4.14-rc1~3894^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6e801e016917989ab8a7ddfc4229a15a5621622a;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/kernel/events/core.c b/kernel/events/core.c
index d345964..d84374f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -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;
 	}