Commit-ID: 2e712675ffd1331bb527dfc851b0e98cd684c2f1 Gitweb: https://git.kernel.org/tip/2e712675ffd1331bb527dfc851b0e98cd684c2f1 Author: Bo YU <tsu.y...@gmail.com> AuthorDate: Mon, 22 Apr 2019 04:01:38 -0400 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Thu, 2 May 2019 16:00:19 -0400
perf bpf: Return value with unlocking in perf_env__find_btf() In perf_env__find_btf(), we're returning without unlocking "env->bpf_progs.lock". There may be cause lockdep issue. Detected by CoversityScan, CID# 1444762:(program hangs(LOCK)) Signed-off-by: Bo YU <tsu.y...@gmail.com> Acked-by: Jiri Olsa <jo...@kernel.org> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Alexei Starovoitov <a...@kernel.org> Cc: Daniel Borkmann <dan...@iogearbox.net> Cc: Martin KaFai Lau <ka...@fb.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Song Liu <songliubrav...@fb.com> Cc: Yonghong Song <y...@fb.com> Cc: b...@vger.kernel.org Cc: net...@vger.kernel.org Fixes: 2db7b1e0bd49d: (perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf()) Link: http://lkml.kernel.org/r/20190422080138.10088-1-tsu.y...@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/env.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 9494f9dc61ec..6a3eaf7d9353 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -115,8 +115,8 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id) } node = NULL; - up_read(&env->bpf_progs.lock); out: + up_read(&env->bpf_progs.lock); return node; }
