mtd: introduce mtd_get_unmapped_area interface

Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/mtdchar.c

@@ -1135,7 +1135,7 @@ static unsigned long mtdchar_get_unmapped_area(struct file *file,
 		if (offset > mtd->size - len)
 			return (unsigned long) -EINVAL;
 
-		return mtd->get_unmapped_area(mtd, len, offset, flags);
+		return mtd_get_unmapped_area(mtd, len, offset, flags);
 	}
 
 	/* can't map directly */

drivers/mtd/mtdconcat.c

@@ -726,8 +726,8 @@ static unsigned long concat_get_unmapped_area(struct mtd_info *mtd,
 			return (unsigned long) -EINVAL;
 
 		if (subdev->get_unmapped_area)
-			return subdev->get_unmapped_area(subdev, len, offset,
-							 flags);
+			return mtd_get_unmapped_area(subdev, len, offset,
+						     flags);
 
 		break;
 	}

drivers/mtd/mtdpart.c

@@ -108,8 +108,7 @@ static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
 	struct mtd_part *part = PART(mtd);
 
 	offset += part->offset;
-	return part->master->get_unmapped_area(part->master, len, offset,
-					       flags);
+	return mtd_get_unmapped_area(part->master, len, offset, flags);
 }
 
 static int part_read_oob(struct mtd_info *mtd, loff_t from,

fs/romfs/mmap-nommu.c

@@ -53,7 +53,7 @@ static unsigned long romfs_get_unmapped_area(struct file *file,
 		if (offset > mtd->size - len)
 			return (unsigned long) -EINVAL;
 
-		return mtd->get_unmapped_area(mtd, len, offset, flags);
+		return mtd_get_unmapped_area(mtd, len, offset, flags);
 	}
 
 cant_map_directly:

include/linux/mtd/mtd.h

@@ -178,11 +178,6 @@ struct mtd_info {
 	int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
 		      size_t *retlen, void **virt, resource_size_t *phys);
 	void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
-
-	/* Allow NOMMU mmap() to directly map the device (if not NULL)
-	 * - return the address to which the offset maps
-	 * - return -ENOSYS to indicate refusal to do the mapping
-	 */
 	unsigned long (*get_unmapped_area) (struct mtd_info *mtd,
 					    unsigned long len,
 					    unsigned long offset,
@@ -293,6 +288,19 @@ static inline void mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 	return mtd->unpoint(mtd, from, len);
 }
 
+/*
+ * Allow NOMMU mmap() to directly map the device (if not NULL)
+ * - return the address to which the offset maps
+ * - return -ENOSYS to indicate refusal to do the mapping
+ */
+static inline unsigned long mtd_get_unmapped_area(struct mtd_info *mtd,
+						  unsigned long len,
+						  unsigned long offset,
+						  unsigned long flags)
+{
+	return mtd->get_unmapped_area(mtd, len, offset, flags);
+}
+
 static inline struct mtd_info *dev_to_mtd(struct device *dev)
 {
 	return dev ? dev_get_drvdata(dev) : NULL;