1 files changed, 29 insertions, 31 deletions

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index f6e7d583998..a11681b4bd9 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -33,7 +33,7 @@
 static DEFINE_MUTEX(pinmux_list_mutex);
 static LIST_HEAD(pinmux_list);
 
-/* Global pinmux maps, we allow one set only */
+/* Global pinmux maps */
 static struct pinmux_map *pinmux_maps;
 static unsigned pinmux_maps_num;
 
@@ -347,48 +347,30 @@ EXPORT_SYMBOL_GPL(pinmux_gpio_direction_output);
 int __init pinmux_register_mappings(struct pinmux_map const *maps,
 				    unsigned num_maps)
 {
-	int ret = 0;
+	void *tmp_maps;
 	int i;
 
-	if (pinmux_maps_num != 0) {
-		pr_err("pinmux mappings already registered, you can only "
-		       "register one set of maps\n");
-		return -EINVAL;
-	}
-
 	pr_debug("add %d pinmux maps\n", num_maps);
 
-	/*
-	 * Make a copy of the map array - string pointers will end up in the
-	 * kernel const section anyway so these do not need to be deep copied.
-	 */
-	pinmux_maps = kmemdup(maps, sizeof(struct pinmux_map) * num_maps,
-			      GFP_KERNEL);
-	if (!pinmux_maps)
-		return -ENOMEM;
-
+	/* First sanity check the new mapping */
 	for (i = 0; i < num_maps; i++) {
-		/* Sanity check the mapping while copying it */
 		if (!maps[i].name) {
 			pr_err("failed to register map %d: "
 			       "no map name given\n", i);
-			ret = -EINVAL;
-			goto err_out_free;
+			return -EINVAL;
 		}
 
 		if (!maps[i].ctrl_dev && !maps[i].ctrl_dev_name) {
 			pr_err("failed to register map %s (%d): "
 			       "no pin control device given\n",
 			       maps[i].name, i);
-			ret = -EINVAL;
-			goto err_out_free;
+			return -EINVAL;
 		}
 
 		if (!maps[i].function) {
 			pr_err("failed to register map %s (%d): "
 			       "no function ID given\n", maps[i].name, i);
-			ret = -EINVAL;
-			goto err_out_free;
+			return -EINVAL;
 		}
 
 		if (!maps[i].dev && !maps[i].dev_name)
@@ -399,17 +381,33 @@ int __init pinmux_register_mappings(struct pinmux_map const *maps,
 			pr_debug("register map %s, function %s\n",
 				 maps[i].name,
 				 maps[i].function);
+	}
 
-		pinmux_maps_num++;
+	/*
+	 * Make a copy of the map array - string pointers will end up in the
+	 * kernel const section anyway so these do not need to be deep copied.
+	 */
+	if (!pinmux_maps_num) {
+		/* On first call, just copy them */
+		tmp_maps = kmemdup(maps,
+				   sizeof(struct pinmux_map) * num_maps,
+				   GFP_KERNEL);
+		if (!tmp_maps)
+			return -ENOMEM;
+	} else {
+		/* Subsequent calls, reallocate array to new size */
+		size_t oldsize = sizeof(struct pinmux_map) * pinmux_maps_num;
+		size_t newsize = sizeof(struct pinmux_map) * num_maps;
+
+		tmp_maps = krealloc(pinmux_maps, oldsize + newsize, GFP_KERNEL);
+		if (!tmp_maps)
+			return -ENOMEM;
+		memcpy((tmp_maps + oldsize), maps, newsize);
 	}
 
+	pinmux_maps = tmp_maps;
+	pinmux_maps_num += num_maps;
 	return 0;
-
-err_out_free:
-	kfree(pinmux_maps);
-	pinmux_maps = NULL;
-	pinmux_maps_num = 0;
-	return ret;
 }
 
 /**