linux-kernel - [tip:perf/urgent] perf symbols: Fix directory descriptor leaking

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Date:	Sat, 17 Jul 2010 11:11:41 GMT
From:	tip-bot for Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, paulus@...ba.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	guijianfeng@...fujitsu.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf symbols: Fix directory descriptor leaking

Commit-ID:  74534341c1214ac5993904680616afe698dde3b6
Gitweb:     http://git.kernel.org/tip/74534341c1214ac5993904680616afe698dde3b6
Author:     Gui Jianfeng <guijianfeng@...fujitsu.com>
AuthorDate: Thu, 24 Jun 2010 15:04:02 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 16 Jul 2010 14:16:47 -0300

perf symbols: Fix directory descriptor leaking

When I ran "perf kvm ... top", I encountered the following error output.

  Error: perfcounter syscall returned with -1 (Too many open files)

  Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?

Looking into perf, I found perf opens too many directories at
initialization time, but forgets to close them. Here is the fix.

LKML-Reference: <4C230362.5080704@...fujitsu.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol.c |   17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b63e571..5b27683 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1443,6 +1443,7 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,
 {
 	struct dirent *dent;
 	DIR *dir = opendir(dir_name);
+	int ret = 0;
 
 	if (!dir) {
 		pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
@@ -1465,8 +1466,9 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,
 
 			snprintf(path, sizeof(path), "%s/%s",
 				 dir_name, dent->d_name);
-			if (map_groups__set_modules_path_dir(self, path) < 0)
-				goto failure;
+			ret = map_groups__set_modules_path_dir(self, path);
+			if (ret < 0)
+				goto out;
 		} else {
 			char *dot = strrchr(dent->d_name, '.'),
 			     dso_name[PATH_MAX];
@@ -1487,17 +1489,18 @@ static int map_groups__set_modules_path_dir(struct map_groups *self,
 				 dir_name, dent->d_name);
 
 			long_name = strdup(path);
-			if (long_name == NULL)
-				goto failure;
+			if (long_name == NULL) {
+				ret = -1;
+				goto out;
+			}
 			dso__set_long_name(map->dso, long_name);
 			dso__kernel_module_get_build_id(map->dso, "");
 		}
 	}
 
-	return 0;
-failure:
+out:
 	closedir(dir);
-	return -1;
+	return ret;
 }
 
 static char *get_kernel_version(const char *root_dir)
--
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