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| author | Qian Cai <cai@lca.pw> | 2019-11-06 06:29:35 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-11-13 11:06:13 +0100 |
| commit | deb0c3c29d552ab81ecd5481bb83bf2f4e41927d (patch) | |
| tree | 2e6054b53e8fc569410b6748e4569d1b833be7b4 | |
| parent | Merge branch 'perf/urgent' into perf/core, to pick up fixes (diff) | |
| download | linux-deb0c3c29d552ab81ecd5481bb83bf2f4e41927d.tar.xz linux-deb0c3c29d552ab81ecd5481bb83bf2f4e41927d.zip | |
perf/core: Fix unlock balance in perf_init_event()
Commit:
66d258c5b048 ("perf/core: Optimize perf_init_event()")
introduced an unlock imbalance in perf_init_event() where it calls
"goto again" and then only repeat rcu_read_unlock().
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 66d258c5b048 ("perf/core: Optimize perf_init_event()")
Link: https://lkml.kernel.org/r/20191106052935.8352-1-cai@lca.pw
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/events/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 6cb6d685191d..8d65e03b98f2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10307,7 +10307,6 @@ static struct pmu *perf_init_event(struct perf_event *event) goto unlock; } - rcu_read_lock(); /* * PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE * are often aliases for PERF_TYPE_RAW. @@ -10317,6 +10316,7 @@ static struct pmu *perf_init_event(struct perf_event *event) type = PERF_TYPE_RAW; again: + rcu_read_lock(); pmu = idr_find(&pmu_idr, type); rcu_read_unlock(); if (pmu) { |