diff --git a/[refs] b/[refs]
index aae3ac494b9b..c6d44490eb25 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: db0fd97c270f1e80321f7ae55234643ca0978c54
+refs/heads/master: 903788892ea0fc7fcaf7e8e5fac9a77379fc215b
diff --git a/trunk/include/linux/kernel.h b/trunk/include/linux/kernel.h
index 05f332afc9e0..8317ec4b9f3b 100644
--- a/trunk/include/linux/kernel.h
+++ b/trunk/include/linux/kernel.h
@@ -375,6 +375,8 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
 	return buf;
 }
 
+extern int hex_to_bin(char ch);
+
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
 #endif
diff --git a/trunk/lib/hexdump.c b/trunk/lib/hexdump.c
index 1bd6a9779774..5d7a4802c562 100644
--- a/trunk/lib/hexdump.c
+++ b/trunk/lib/hexdump.c
@@ -15,6 +15,24 @@
 const char hex_asc[] = "0123456789abcdef";
 EXPORT_SYMBOL(hex_asc);
 
+/**
+ * hex_to_bin - convert a hex digit to its real value
+ * @ch: ascii character represents hex digit
+ *
+ * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
+ * input.
+ */
+int hex_to_bin(char ch)
+{
+	if ((ch >= '0') && (ch <= '9'))
+		return ch - '0';
+	ch = tolower(ch);
+	if ((ch >= 'a') && (ch <= 'f'))
+		return ch - 'a' + 10;
+	return -1;
+}
+EXPORT_SYMBOL(hex_to_bin);
+
 /**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump