Commit 47b34d2e authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman

serial: 8250_mid: fix divide error bug if baud rate is 0

Since the commit c1a67b48 ("serial: 8250_pci: replace switch-case by
formula for Intel MID"), the 8250 driver crashes in the byt_set_termios()
function with a divide error. This is caused by the fact that a baud rate of 0
(B0) is not handled properly. Fix it by falling back to B9600 in this case.
Reported-by: default avatar"Mendez Salinas, Fernando" <>
Fixes: c1a67b48 ("serial: 8250_pci: replace switch-case by formula for Intel MID")
Signed-off-by: default avatarAndy Shevchenko <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 5db4f7f8
......@@ -168,6 +168,9 @@ static void mid8250_set_termios(struct uart_port *p,
unsigned long w = BIT(24) - 1;
unsigned long mul, div;
/* Gracefully handle the B0 case: fall back to B9600 */
fuart = fuart ? fuart : 9600 * 16;
if (mid->board->freq < fuart) {
/* Find prescaler value that satisfies Fuart < Fref */
if (mid->board->freq > baud)
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment