else
offset += idx * board->uart_offset;
- maxnr = (pci_resource_len(priv->dev, bar) - board->first_offset) /
- (8 << board->reg_shift);
+ maxnr = (pci_resource_len(priv->dev, bar) - board->first_offset) >>
+ (board->reg_shift + 3);
if (board->flags & FL_REGION_SZ_CAP && idx >= maxnr)
return 1;