From 25a7d914274de38637c5199342eb90a297361386 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 17 May 2018 14:27:29 -0300 Subject: perf parse-events: Use get/put_events_file() Instead of accessing the trace_events_path variable directly, that may not have been properly initialized wrt detecting where tracefs is mounted. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-id7hzn1ydgkxbumeve5wapqz@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/parse-events.c | 7 +++--- tools/perf/util/parse-events.c | 50 +++++++++++++++++++++++++++-------------- tools/perf/util/trace-event.c | 8 +++++-- 3 files changed, 43 insertions(+), 22 deletions(-) (limited to 'tools/perf') diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c index 6829dd416a99..6d57d7082637 100644 --- a/tools/perf/tests/parse-events.c +++ b/tools/perf/tests/parse-events.c @@ -1328,7 +1328,7 @@ static int count_tracepoints(void) TEST_ASSERT_VAL("Can't open events dir", events_dir); while ((events_ent = readdir(events_dir))) { - char sys_path[PATH_MAX]; + char *sys_path; struct dirent *sys_ent; DIR *sys_dir; @@ -1339,8 +1339,8 @@ static int count_tracepoints(void) || !strcmp(events_ent->d_name, "header_page")) continue; - scnprintf(sys_path, PATH_MAX, "%s/%s", - tracing_events_path, events_ent->d_name); + sys_path = get_events_file(events_ent->d_name); + TEST_ASSERT_VAL("Can't get sys path", sys_path); sys_dir = opendir(sys_path); TEST_ASSERT_VAL("Can't open sys dir", sys_dir); @@ -1356,6 +1356,7 @@ static int count_tracepoints(void) } closedir(sys_dir); + put_events_file(sys_path); } closedir(events_dir); diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index f9d5bbd63484..24668300b327 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -189,19 +189,19 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config) int fd; u64 id; char evt_path[MAXPATHLEN]; - char dir_path[MAXPATHLEN]; + char *dir_path; sys_dir = opendir(tracing_events_path); if (!sys_dir) return NULL; for_each_subsystem(sys_dir, sys_dirent) { - - snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, - sys_dirent->d_name); + dir_path = get_events_file(sys_dirent->d_name); + if (!dir_path) + continue; evt_dir = opendir(dir_path); if (!evt_dir) - continue; + goto next; for_each_event(dir_path, evt_dir, evt_dirent) { @@ -217,6 +217,7 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config) close(fd); id = atoll(id_buf); if (id == config) { + put_events_file(dir_path); closedir(evt_dir); closedir(sys_dir); path = zalloc(sizeof(*path)); @@ -241,6 +242,8 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config) } } closedir(evt_dir); +next: + put_events_file(dir_path); } closedir(sys_dir); @@ -511,14 +514,19 @@ static int add_tracepoint_multi_event(struct list_head *list, int *idx, struct parse_events_error *err, struct list_head *head_config) { - char evt_path[MAXPATHLEN]; + char *evt_path; struct dirent *evt_ent; DIR *evt_dir; int ret = 0, found = 0; - snprintf(evt_path, MAXPATHLEN, "%s/%s", tracing_events_path, sys_name); + evt_path = get_events_file(sys_name); + if (!evt_path) { + tracepoint_error(err, errno, sys_name, evt_name); + return -1; + } evt_dir = opendir(evt_path); if (!evt_dir) { + put_events_file(evt_path); tracepoint_error(err, errno, sys_name, evt_name); return -1; } @@ -544,6 +552,7 @@ static int add_tracepoint_multi_event(struct list_head *list, int *idx, ret = -1; } + put_events_file(evt_path); closedir(evt_dir); return ret; } @@ -2091,7 +2100,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob, DIR *sys_dir, *evt_dir; struct dirent *sys_dirent, *evt_dirent; char evt_path[MAXPATHLEN]; - char dir_path[MAXPATHLEN]; + char *dir_path; char **evt_list = NULL; unsigned int evt_i = 0, evt_num = 0; bool evt_num_known = false; @@ -2112,11 +2121,12 @@ restart: !strglobmatch(sys_dirent->d_name, subsys_glob)) continue; - snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, - sys_dirent->d_name); + dir_path = get_events_file(sys_dirent->d_name); + if (!dir_path) + continue; evt_dir = opendir(dir_path); if (!evt_dir) - continue; + goto next; for_each_event(dir_path, evt_dir, evt_dirent) { if (event_glob != NULL && @@ -2132,11 +2142,15 @@ restart: sys_dirent->d_name, evt_dirent->d_name); evt_list[evt_i] = strdup(evt_path); - if (evt_list[evt_i] == NULL) + if (evt_list[evt_i] == NULL) { + put_events_file(dir_path); goto out_close_evt_dir; + } evt_i++; } closedir(evt_dir); +next: + put_events_file(dir_path); } closedir(sys_dir); @@ -2184,19 +2198,19 @@ int is_valid_tracepoint(const char *event_string) DIR *sys_dir, *evt_dir; struct dirent *sys_dirent, *evt_dirent; char evt_path[MAXPATHLEN]; - char dir_path[MAXPATHLEN]; + char *dir_path; sys_dir = opendir(tracing_events_path); if (!sys_dir) return 0; for_each_subsystem(sys_dir, sys_dirent) { - - snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, - sys_dirent->d_name); + dir_path = get_events_file(sys_dirent->d_name); + if (!dir_path) + continue; evt_dir = opendir(dir_path); if (!evt_dir) - continue; + goto next; for_each_event(dir_path, evt_dir, evt_dirent) { snprintf(evt_path, MAXPATHLEN, "%s:%s", @@ -2208,6 +2222,8 @@ int is_valid_tracepoint(const char *event_string) } } closedir(evt_dir); +next: + put_events_file(dir_path); } closedir(sys_dir); return 0; diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c index 16a776371d03..1aa368603268 100644 --- a/tools/perf/util/trace-event.c +++ b/tools/perf/util/trace-event.c @@ -75,6 +75,7 @@ void trace_event__cleanup(struct trace_event *t) static struct event_format* tp_format(const char *sys, const char *name) { + char *tp_dir = get_events_file(sys); struct pevent *pevent = tevent.pevent; struct event_format *event = NULL; char path[PATH_MAX]; @@ -82,8 +83,11 @@ tp_format(const char *sys, const char *name) char *data; int err; - scnprintf(path, PATH_MAX, "%s/%s/%s/format", - tracing_events_path, sys, name); + if (!tp_dir) + return ERR_PTR(-errno); + + scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name); + put_events_file(tp_dir); err = filename__read_str(path, &data, &size); if (err) -- cgit v1.2.3