mtd: do not use mtd->lock, unlock and is_locked directly

Instead, call the corresponding MTD API function which will return
'-EOPNOTSUPP' if the operation is not supported.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/maps/scb2_flash.c

@@ -204,7 +204,6 @@ scb2_flash_remove(struct pci_dev *dev)
 		return;
 
 	/* disable flash writes */
-	if (scb2_mtd->lock)
 	mtd_lock(scb2_mtd, 0, scb2_mtd->size);
 
 	mtd_device_unregister(scb2_mtd);

drivers/mtd/mtdchar.c

@@ -814,9 +814,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
 			return -EFAULT;
 
-		if (!mtd->lock)
-			ret = -EOPNOTSUPP;
-		else
 		ret = mtd_lock(mtd, einfo.start, einfo.length);
 		break;
 	}
@@ -828,9 +825,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
 			return -EFAULT;
 
-		if (!mtd->unlock)
-			ret = -EOPNOTSUPP;
-		else
 		ret = mtd_unlock(mtd, einfo.start, einfo.length);
 		break;
 	}
@@ -842,9 +836,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
 			return -EFAULT;
 
-		if (!mtd->is_locked)
-			ret = -EOPNOTSUPP;
-		else
 		ret = mtd_is_locked(mtd, einfo.start, einfo.length);
 		break;
 	}

drivers/mtd/mtdconcat.c

@@ -555,12 +555,9 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 		else
 			size = len;
 
-		if (subdev->lock) {
 		err = mtd_lock(subdev, ofs, size);
 		if (err)
 			break;
-		} else
-			err = -EOPNOTSUPP;
 
 		len -= size;
 		if (len == 0)
@@ -595,12 +592,9 @@ static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 		else
 			size = len;
 
-		if (subdev->unlock) {
 		err = mtd_unlock(subdev, ofs, size);
 		if (err)
 			break;
-		} else
-			err = -EOPNOTSUPP;
 
 		len -= size;
 		if (len == 0)

drivers/mtd/mtdcore.c

@@ -339,9 +339,9 @@ int add_mtd_device(struct mtd_info *mtd)
 	mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;
 
 	/* Some chips always power up locked. Unlock them now */
-	if ((mtd->flags & MTD_WRITEABLE)
-	    && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
-		if (mtd_unlock(mtd, 0, mtd->size))
+	if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) {
+		error = mtd_unlock(mtd, 0, mtd->size);
+		if (error && error != -EOPNOTSUPP)
 			printk(KERN_WARNING
 			       "%s: unlock failed, writes may not work\n",
 			       mtd->name);

include/linux/mtd/mtd.h

@@ -406,16 +406,22 @@ static inline void mtd_sync(struct mtd_info *mtd)
 /* Chip-supported device locking */
 static inline int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
+	if (!mtd->lock)
+		return -EOPNOTSUPP;
 	return mtd->lock(mtd, ofs, len);
 }
 
 static inline int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
+	if (!mtd->unlock)
+		return -EOPNOTSUPP;
 	return mtd->unlock(mtd, ofs, len);
 }
 
 static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
+	if (!mtd->is_locked)
+		return -EOPNOTSUPP;
 	return mtd->is_locked(mtd, ofs, len);
 }