linux-kernel - [PATCH] perf bpf: return value with unlocking in perf_env__find

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Date:   Mon, 22 Apr 2019 04:01:38 -0400
From:   Bo YU <tsu.yubo@...il.com>
To:     peterz@...radead.org, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, ast@...nel.org, daniel@...earbox.net,
        kafai@...com, songliubraving@...com, yhs@...com,
        adrian.hunter@...el.com
Cc:     Bo YU <tsu.yubo@...il.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH] perf bpf: return value with unlocking in perf_env__find_btf()

In perf_env__find_btf(), returning without unlocking
"env->bpf_progs.lock". There may be cause lockdep issue.

DEtected by CoversityScan, CID# 1444762:(program hangs(LOCK))

Fixes: 2db7b1e0bd49d: (perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf())
Signed-off-by: Bo YU <tsu.yubo@...il.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;
 }
 
-- 
2.11.0