Commit 6f210c18 authored by David Müller's avatar David Müller Committed by Greg Kroah-Hartman

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

Since commit 21947ba6 ("serial: 8250_pci: replace switch-case by
formula"), 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.
Signed-off-by: default avatarDavid Müller <>
Fixes: 21947ba6 ("serial: 8250_pci: replace switch-case by formula")
Suggested-by: default avatarAndy Shevchenko <>
Reviewed-by: default avatarAndy Shevchenko <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 02da2d72
......@@ -1377,6 +1377,9 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios,
unsigned long m, n;
u32 reg;
/* Gracefully handle the B0 case: fall back to B9600 */
fuart = fuart ? fuart : 9600 * 16;
/* Get Fuart closer to Fref */
fuart *= rounddown_pow_of_two(fref / fuart);
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