[MTD] physmap: fix memory leak on physmap_flash_remove by using devres

physmap_flash_remove releases only last memory region. This causes
memory leak if multiple resources were provided.

This patch fixes this leakage by using devm_ functions.

Signed-off-by: Atsushi Nemoto <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/maps/physmap.c

···
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/physmap.h>
 #include <linux/mtd/concat.h>
-#include <asm/io.h>
+#include <linux/io.h>
 
 #define MAX_RESOURCES		4
 
···
 	struct mtd_info		*mtd[MAX_RESOURCES];
 	struct mtd_info		*cmtd;
 	struct map_info		map[MAX_RESOURCES];
-	struct resource		*res;
 #ifdef CONFIG_MTD_PARTITIONS
 	int			nr_parts;
 	struct mtd_partition	*parts;
···
 #endif
 			map_destroy(info->mtd[i]);
 		}
-
-		if (info->map[i].virt != NULL)
-			iounmap(info->map[i].virt);
 	}
-
-	if (info->res != NULL) {
-		release_resource(info->res);
-		kfree(info->res);
-	}
-
 	return 0;
 }
 
···
 	if (physmap_data == NULL)
 		return -ENODEV;
 
-	info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
+	info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
+			    GFP_KERNEL);
 	if (info == NULL) {
 		err = -ENOMEM;
 		goto err_out;
···
 		       (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
 		       (unsigned long long)dev->resource[i].start);
 
-		info->res = request_mem_region(dev->resource[i].start,
-					       dev->resource[i].end - dev->resource[i].start + 1,
-					       dev->dev.bus_id);
-		if (info->res == NULL) {
+		if (!devm_request_mem_region(&dev->dev,
+			dev->resource[i].start,
+			dev->resource[i].end - dev->resource[i].start + 1,
+			dev->dev.bus_id)) {
 			dev_err(&dev->dev, "Could not reserve memory region\n");
 			err = -ENOMEM;
 			goto err_out;
···
 		info->map[i].bankwidth = physmap_data->width;
 		info->map[i].set_vpp = physmap_data->set_vpp;
 
-		info->map[i].virt = ioremap(info->map[i].phys, info->map[i].size);
+		info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
+						 info->map[i].size);
 		if (info->map[i].virt == NULL) {
 			dev_err(&dev->dev, "Failed to ioremap flash region\n");
 			err = EIO;