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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 <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-id7hzn1ydgkxbumeve5wapqz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-05-17 14:27:29 -03:00
parent c02cab228e
commit 25a7d91427
3 changed files with 43 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
tools/perf/tests/parse-events.c
View File

@ -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);

50
tools/perf/util/parse-events.c
View File

@ -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;

8
tools/perf/util/trace-event.c
View File

@ -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)