diff --git a/mm/readahead.c b/mm/readahead.c
index 7a21199c6227d7c106f3e48a7dcb495e61116b96..7d78f86fcf6f65d25fa1295511c22f5ac7b14417 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -659,7 +659,8 @@ ssize_t ksys_readahead(int fd, loff_t offset, size_t count)
 	 */
 	ret = -EINVAL;
 	if (!f.file->f_mapping || !f.file->f_mapping->a_ops ||
-	    !S_ISREG(file_inode(f.file)->i_mode))
+	    (!S_ISREG(file_inode(f.file)->i_mode) &&
+	    !S_ISBLK(file_inode(f.file)->i_mode)))
 		goto out;
 
 	ret = vfs_fadvise(f.file, offset, count, POSIX_FADV_WILLNEED);