mfd: reduce stack usage in mfd-core.c

This patch moves the allocation of the resources off the stack in
mfd_add_device().

Signed-off-by: Ian Molton <spyro@f2s.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

drivers/mfd/mfd-core.c

@@ -20,7 +20,7 @@ static int mfd_add_device(struct device *parent, int id,
 			  struct resource *mem_base,
 			  int irq_base)
 {
-	struct resource res[cell->num_resources];
+	struct resource *res;
 	struct platform_device *pdev;
 	int ret = -ENOMEM;
 	int r;
@@ -29,14 +29,17 @@ static int mfd_add_device(struct device *parent, int id,
 	if (!pdev)
 		goto fail_alloc;
 
+	res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
+	if (!res)
+		goto fail_device;
+
 	pdev->dev.parent = parent;
 
 	ret = platform_device_add_data(pdev,
 			cell->platform_data, cell->data_size);
 	if (ret)
-		goto fail_device;
+		goto fail_res;
 
-	memset(res, 0, sizeof(res));
 	for (r = 0; r < cell->num_resources; r++) {
 		res[r].name = cell->resources[r].name;
 		res[r].flags = cell->resources[r].flags;
@@ -64,11 +67,15 @@ static int mfd_add_device(struct device *parent, int id,
 
 	ret = platform_device_add(pdev);
 	if (ret)
-		goto fail_device;
+		goto fail_res;
+
+	kfree(res);
 
 	return 0;
 
 /*	platform_device_del(pdev); */
+fail_res:
+	kfree(res);
 fail_device:
 	platform_device_put(pdev);
 fail_alloc: