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-rw-r--r--drivers/serial/8250_pci.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index 94886c000d2a..864ef859be56 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -594,8 +594,8 @@ pci_default_setup(struct serial_private *priv, struct pciserial_board *board,
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;