Merge branch 'for-next/net' into master

1 files changed, 52 insertions, 2 deletions

diff --git a/common/globalvar.c b/common/globalvar.c
index eefee73e7a..5bde86aad0 100644
--- a/common/globalvar.c
+++ b/common/globalvar.c
@@ -293,6 +293,53 @@ int nvvar_remove(const char *name)
 	return ret;
 }
 
+struct globalvar_deprecated {
+	char *newname;
+	char *oldname;
+	struct list_head list;
+};
+
+static LIST_HEAD(globalvar_deprecated_list);
+
+/*
+ * globalvar_alias_deprecated - add an alias
+ *
+ * @oldname: The old name for the variable
+ * @newname: The new name for the variable
+ *
+ * This function is a helper for globalvars that are renamed from one
+ * release to another. when a variable @oldname is found in the persistent
+ * environment a warning is issued and its value is written to @newname.
+ *
+ * Note that when both @oldname and @newname contain values then the values
+ * existing in @newname are overwritten.
+ */
+void globalvar_alias_deprecated(const char *oldname, const char *newname)
+{
+	struct globalvar_deprecated *gd;
+
+	gd = xzalloc(sizeof(*gd));
+	gd->newname = xstrdup(newname);
+	gd->oldname = xstrdup(oldname);
+	list_add_tail(&gd->list, &globalvar_deprecated_list);
+}
+
+static const char *globalvar_new_name(const char *oldname)
+{
+	struct globalvar_deprecated *gd;
+
+	list_for_each_entry(gd, &globalvar_deprecated_list, list) {
+		if (!strcmp(oldname, gd->oldname)) {
+			pr_warn("nv.%s is deprecated, converting to nv.%s\n", oldname,
+				gd->newname);
+			nv_dirty = 1;
+			return gd->newname;
+		}
+	}
+
+	return oldname;
+}
+
 int nvvar_load(void)
 {
 	char *val;
@@ -308,6 +355,8 @@ int nvvar_load(void)
 		return -ENOENT;
 
 	while ((d = readdir(dir))) {
+		const char *n;
+
 		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 			continue;
 
@@ -316,10 +365,11 @@ int nvvar_load(void)
 		pr_debug("%s: Setting \"%s\" to \"%s\"\n",
 				__func__, d->d_name, val);
 
-		ret = __nvvar_add(d->d_name, val);
+		n = globalvar_new_name(d->d_name);
+		ret = __nvvar_add(n, val);
 		if (ret)
 			pr_err("failed to create nv variable %s: %s\n",
-					d->d_name, strerror(-ret));
+					n, strerror(-ret));
 	}
 
 	closedir(dir);