linux-kernel - [PATCH] perf: Fix pass 0 to PTR

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Message-ID: <20220505135713.18496-1-yuehaibing@huawei.com>
Date:   Thu, 5 May 2022 21:57:13 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andrii@...nel.org>, <kafai@...com>,
        <songliubraving@...com>, <yhs@...com>, <john.fastabend@...il.com>,
        <kpsingh@...nel.org>, <christylee@...com>
CC:     <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] perf: Fix pass 0 to PTR_ERR

Passing NULL to PTR_ERR will result in 0 (success), also move
evlist__find_evsel_by_str() behind for minor optimization.

Fixes: 924b1cd61148 ("perf: Stop using bpf_map__def() API")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 tools/perf/util/bpf-loader.c | 15 ++++++++-------
 tools/perf/util/bpf_map.c    |  2 +-
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index f8ad581ea247..b301ffc8c6e7 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -1253,21 +1253,22 @@ __bpf_map__config_event(struct bpf_map *map,
 			struct parse_events_term *term,
 			struct evlist *evlist)
 {
-	struct bpf_map_op *op;
 	const char *map_name = bpf_map__name(map);
-	struct evsel *evsel = evlist__find_evsel_by_str(evlist, term->val.str);
+	struct bpf_map_op *op;
+	struct evsel *evsel;
 
+	if (!map) {
+		pr_debug("Map '%s' is invalid\n", map_name);
+		return -BPF_LOADER_ERRNO__INTERNAL;
+	}
+
+	evsel = evlist__find_evsel_by_str(evlist, term->val.str);
 	if (!evsel) {
 		pr_debug("Event (for '%s') '%s' doesn't exist\n",
 			 map_name, term->val.str);
 		return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
 	}
 
-	if (!map) {
-		pr_debug("Map '%s' is invalid\n", map_name);
-		return PTR_ERR(map);
-	}
-
 	/*
 	 * No need to check key_size and value_size:
 	 * kernel has already checked them.
diff --git a/tools/perf/util/bpf_map.c b/tools/perf/util/bpf_map.c
index c863ae0c5cb5..c72aee6a91ee 100644
--- a/tools/perf/util/bpf_map.c
+++ b/tools/perf/util/bpf_map.c
@@ -36,7 +36,7 @@ int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
 		return fd;
 
 	if (!map)
-		return PTR_ERR(map);
+		return -EINVAL;
 
 	err = -ENOMEM;
 	key = malloc(bpf_map__key_size(map));
-- 
2.17.1