X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=init%2Fdo_mounts.c;h=2974c8b3b351b4a15b38acca4478e4032fece9fa;hb=5d48421be3c8a9f753d61b826ecb3ad287d867c0;hp=b2eee02e0f83fd720f38cf83a2b5e58ea27997b1;hpb=ac69e0928054ff29a5049902fb477f9c7605c773;p=android-x86%2Fkernel.git

diff --git a/init/do_mounts.c b/init/do_mounts.c
index b2eee02e0f83..2974c8b3b351 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -400,15 +400,42 @@ out:
 }
  
 #ifdef CONFIG_ROOT_NFS
+
+#define NFSROOT_TIMEOUT_MIN	5
+#define NFSROOT_TIMEOUT_MAX	30
+#define NFSROOT_RETRY_MAX	5
+
 static int __init mount_nfs_root(void)
 {
 	char *root_dev, *root_data;
+	unsigned int timeout;
+	int try, err;
 
-	if (nfs_root_data(&root_dev, &root_data) != 0)
-		return 0;
-	if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
+	err = nfs_root_data(&root_dev, &root_data);
+	if (err != 0)
 		return 0;
-	return 1;
+
+	/*
+	 * The server or network may not be ready, so try several
+	 * times.  Stop after a few tries in case the client wants
+	 * to fall back to other boot methods.
+	 */
+	timeout = NFSROOT_TIMEOUT_MIN;
+	for (try = 1; ; try++) {
+		err = do_mount_root(root_dev, "nfs",
+					root_mountflags, root_data);
+		if (err == 0)
+			return 1;
+		if (try > NFSROOT_RETRY_MAX)
+			break;
+
+		/* Wait, in case the server refused us immediately */
+		ssleep(timeout);
+		timeout <<= 1;
+		if (timeout > NFSROOT_TIMEOUT_MAX)
+			timeout = NFSROOT_TIMEOUT_MAX;
+	}
+	return 0;
 }
 #endif