perf probe: Fix to remove dot suffix from second or latter events

Fix to remove dot suffix (e.g. .const, .isra) from the second or latter
events which has suffix numbers.

Since the previous commit 35a23ff928 ("perf probe: Cut off the gcc
optimization postfixes from function name") didn't care about the suffix
numbered events, therefore we'll have an error when we add additional
events on the same dot suffix functions.

e.g.
  ----
  # ./perf probe -f -a get_sigframe.isra.2.constprop.3 \
   -a get_sigframe.isra.2.constprop.3
  Failed to write event: Invalid argument
    Error: Failed to add events.
  ----

This fixes above issue as below:
  ----
  # ./perf probe -f -a get_sigframe.isra.2.constprop.3 \
   -a get_sigframe.isra.2.constprop.3
  Added new events:
    probe:get_sigframe   (on get_sigframe.isra.2.constprop.3)
    probe:get_sigframe_1 (on get_sigframe.isra.2.constprop.3)

  You can now use it in all perf tools, such as:

          perf record -e probe:get_sigframe_1 -aR sleep 1

  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20150930164130.3733.26573.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -2289,36 +2289,41 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
 			      struct strlist *namelist, bool allow_suffix)
 {
 	int i, ret;
-	char *p;
+	char *p, *nbase;
 
 	if (*base == '.')
 		base++;
+	nbase = strdup(base);
+	if (!nbase)
+		return -ENOMEM;
 
-	/* Try no suffix */
-	ret = e_snprintf(buf, len, "%s", base);
+	/* Cut off the dot suffixes (e.g. .const, .isra)*/
+	p = strchr(nbase, '.');
+	if (p && p != nbase)
+		*p = '\0';
+
+	/* Try no suffix number */
+	ret = e_snprintf(buf, len, "%s", nbase);
 	if (ret < 0) {
 		pr_debug("snprintf() failed: %d\n", ret);
-		return ret;
+		goto out;
 	}
-	/* Cut off the postfixes (e.g. .const, .isra)*/
-	p = strchr(buf, '.');
-	if (p && p != buf)
-		*p = '\0';
 	if (!strlist__has_entry(namelist, buf))
-		return 0;
+		goto out;
 
 	if (!allow_suffix) {
 		pr_warning("Error: event \"%s\" already exists. "
-			   "(Use -f to force duplicates.)\n", base);
-		return -EEXIST;
+			   "(Use -f to force duplicates.)\n", buf);
+		ret = -EEXIST;
+		goto out;
 	}
 
 	/* Try to add suffix */
 	for (i = 1; i < MAX_EVENT_INDEX; i++) {
-		ret = e_snprintf(buf, len, "%s_%d", base, i);
+		ret = e_snprintf(buf, len, "%s_%d", nbase, i);
 		if (ret < 0) {
 			pr_debug("snprintf() failed: %d\n", ret);
-			return ret;
+			goto out;
 		}
 		if (!strlist__has_entry(namelist, buf))
 			break;
@@ -2328,6 +2333,8 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
 		ret = -ERANGE;
 	}
 
+out:
+	free(nbase);
 	return ret;
 }