From 489609bb44fe8834c76c772f2cff8f03dbb84e08 Mon Sep 17 00:00:00 2001
From: Jeff Sharkey <jsharkey@android.com>
Date: Tue, 25 Sep 2012 11:10:16 -0700
Subject: [PATCH] Allow mkdir() race to succeed.

When two zygotes are starting, they both may try creating a mount
point after checking lstat().  The second mkdir() will result in
EEXIST, which is okay to ignore.

Bug: 7165469
Change-Id: If4411e2621f773c74cd05247899982fa5ebdd020
---
 libcutils/fs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libcutils/fs.c b/libcutils/fs.c
index a9889b2bf..1226d447e 100644
--- a/libcutils/fs.c
+++ b/libcutils/fs.c
@@ -55,8 +55,10 @@ int fs_prepare_dir(const char* path, mode_t mode, uid_t uid, gid_t gid) {
 
 create:
     if (TEMP_FAILURE_RETRY(mkdir(path, mode)) == -1) {
-        ALOGE("Failed to mkdir(%s): %s", path, strerror(errno));
-        return -1;
+        if (errno != EEXIST) {
+            ALOGE("Failed to mkdir(%s): %s", path, strerror(errno));
+            return -1;
+        }
     }
 
 fixup: