From 1261a02a0c0ab8e643125705f0d1d83e5090e4d1 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Tue, 24 Nov 2009 05:27:18 -0800 Subject: [PATCH] perf_events, x86: Fix validate_event bug The validate_event() was failing on valid event combinations. The function was assuming that if x86_schedule_event() returned 0, it meant error. But x86_schedule_event() returns the counter index and 0 is a perfectly valid value. An error is returned if the function returns a negative value. Furthermore, validate_event() was also failing for event groups because the event->pmu was not set until after hw_perf_event_init(). Signed-off-by: Stephane Eranian Cc: peterz@infradead.org Cc: paulus@samba.org Cc: perfmon2-devel@lists.sourceforge.net Cc: eranian@gmail.com LKML-Reference: <4b0bdf36.1818d00a.07cc.25ae@mx.google.com> Signed-off-by: Ingo Molnar -- arch/x86/kernel/cpu/perf_event.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- arch/x86/kernel/cpu/perf_event.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index bd8743024204..c1bbed1021d9 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -2229,10 +2229,10 @@ validate_event(struct cpu_hw_events *cpuc, struct perf_event *event) { struct hw_perf_event fake_event = event->hw; - if (event->pmu != &pmu) + if (event->pmu && event->pmu != &pmu) return 0; - return x86_schedule_event(cpuc, &fake_event); + return x86_schedule_event(cpuc, &fake_event) >= 0; } static int validate_group(struct perf_event *event) -- 2.30.2