perf tools: Let get_tracing_file() return NULL to indicate failure.

So that it can be used by other places.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1363850332-25297-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 5729f43..81c6732 100644 (file)
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -62,7 +62,7 @@ static const char *find_debugfs(void)
        const char *path = perf_debugfs_mount(NULL);
 
        if (!path)
-               die("Your kernel not support debugfs filesystem");
+               pr_debug("Your kernel does not support the debugfs filesystem");
 
        return path;
 }
@@ -81,8 +81,12 @@ static const char *find_tracing_dir(void)
                return tracing;
 
        debugfs = find_debugfs();
+       if (!debugfs)
+               return NULL;
 
-       tracing = malloc_or_die(strlen(debugfs) + 9);
+       tracing = malloc(strlen(debugfs) + 9);
+       if (!tracing)
+               return NULL;
 
        sprintf(tracing, "%s/tracing", debugfs);
 
@@ -99,7 +103,9 @@ static char *get_tracing_file(const char *name)
        if (!tracing)
                return NULL;
 
-       file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
+       file = malloc(strlen(tracing) + strlen(name) + 2);
+       if (!file)
+               return NULL;
 
        sprintf(file, "%s/%s", tracing, name);
        return file;
@@ -170,6 +176,9 @@ static void read_header_files(void)
        struct stat st;
 
        path = get_tracing_file("events/header_page");
+       if (!path)
+               die("can't get tracing/events/header_page");
+
        if (stat(path, &st) < 0)
                die("can't read '%s'", path);
 
@@ -178,6 +187,9 @@ static void read_header_files(void)
        put_tracing_file(path);
 
        path = get_tracing_file("events/header_event");
+       if (!path)
+               die("can't get tracing/events/header_event");
+
        if (stat(path, &st) < 0)
                die("can't read '%s'", path);
 
@@ -251,6 +263,8 @@ static void read_ftrace_files(struct tracepoint_path *tps)
        char *path;
 
        path = get_tracing_file("events/ftrace");
+       if (!path)
+               die("can't get tracing/events/ftrace");
 
        copy_event_system(path, tps);
 
@@ -279,6 +293,8 @@ static void read_event_files(struct tracepoint_path *tps)
        int ret;
 
        path = get_tracing_file("events");
+       if (!path)
+               die("can't get tracing/events");
 
        dir = opendir(path);
        if (!dir)
@@ -343,6 +359,9 @@ static void read_ftrace_printk(void)
        int ret;
 
        path = get_tracing_file("printk_formats");
+       if (!path)
+               die("can't get tracing/printk_formats");
+
        ret = stat(path, &st);
        if (ret < 0) {
                /* not found */