linux-kernel - [PATCH] perf stat: Fix error check for bpf_program_

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Message-Id: <20210527220052.1657578-1-namhyung@kernel.org>
Date:   Thu, 27 May 2021 15:00:52 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH] perf stat: Fix error check for bpf_program__attach

It seems the bpf_program__attach() returns a negative error code
instead of a NULL pointer in case of error.

Fixes: 7fac83aaf2ee ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF")
Cc: Song Liu <songliubraving@...com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/bpf_counter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index ddb52f748c8e..974f10e356f0 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -451,10 +451,10 @@ static int bperf_reload_leader_program(struct evsel *evsel, int attr_map_fd,
 		goto out;
 	}
 
-	err = -1;
 	link = bpf_program__attach(skel->progs.on_switch);
-	if (!link) {
+	if (IS_ERR(link)) {
 		pr_err("Failed to attach leader program\n");
+		err = PTR_ERR(link);
 		goto out;
 	}
 
-- 
2.32.0.rc0.204.g9fa02ecfa5-goog