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perf stat: Fix error check for bpf_program__attach

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

Fixes: 7fac83aaf2 ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Link: http://lore.kernel.org/lkml/20210527220052.1657578-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2021-05-27 15:00:52 -07:00 committed by Arnaldo Carvalho de Melo
parent c59870e211
commit c673b7f59e
1 changed files with 2 additions and 2 deletions
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4
tools/perf/util/bpf_counter.c
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@ -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;
}