[PATCH] perf/powerpc: reset event hw state when adding it to the PMU

[Alexandru-Cezar Sardan]

When adding an event to the PMU with PERF_EF_START the STOPPED and UPTODATE
flags need to be cleared in the hw.event status variable because they are
preventing the update of the event count on overflow interrupt.

Signed-off-by: Alexandru-Cezar Sardan <alexandru.sardan at freescale.com>
---
 arch/powerpc/perf/core-fsl-emb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/perf/core-fsl-emb.c b/arch/powerpc/perf/core-fsl-emb.c
index d35ae52..ef2ce48 100644
--- a/arch/powerpc/perf/core-fsl-emb.c
+++ b/arch/powerpc/perf/core-fsl-emb.c
@@ -330,9 +330,11 @@ static int fsl_emb_pmu_add(struct perf_event *event, int flags)
 	}
 	local64_set(&event->hw.prev_count, val);
 
-	if (!(flags & PERF_EF_START)) {
+	if (unlikely(!(flags & PERF_EF_START))) {
 		event->hw.state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
 		val = 0;
+	} else {
+		event->hw.state &= ~(PERF_HES_STOPPED | PERF_HES_UPTODATE);
 	}
 
 	write_pmc(i, val);
-- 
1.7.9.5