dt-binding: net: sfp binding documentation

[linux-2.6-block.git] / lib / nlattr.c

diff --git a/lib/nlattr.c b/lib/nlattr.c
index ee79b7a3c6b0bf2e3c19d639f04d11d7302619c2..927c2f19f119e4eb4f21b02987db34e3edc97fa8 100644 (file)
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -301,6 +301,30 @@ size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
 }
 EXPORT_SYMBOL(nla_strlcpy);
 
+/**
+ * nla_strdup - Copy string attribute payload into a newly allocated buffer
+ * @nla: attribute to copy the string from
+ * @flags: the type of memory to allocate (see kmalloc).
+ *
+ * Returns a pointer to the allocated buffer or NULL on error.
+ */
+char *nla_strdup(const struct nlattr *nla, gfp_t flags)
+{
+       size_t srclen = nla_len(nla);
+       char *src = nla_data(nla), *dst;
+
+       if (srclen > 0 && src[srclen - 1] == '\0')
+               srclen--;
+
+       dst = kmalloc(srclen + 1, flags);
+       if (dst != NULL) {
+               memcpy(dst, src, srclen);
+               dst[srclen] = '\0';
+       }
+       return dst;
+}
+EXPORT_SYMBOL(nla_strdup);
+
 /**
  * nla_memcpy - Copy a netlink attribute into another memory area
  * @dest: where to copy to memcpy