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Commit 47b34d2e authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman
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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" <fernando.mendez.salinas@intel.com>
Fixes: c1a67b48 ("serial: 8250_pci: replace switch-case by formula for Intel MID")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5db4f7f8

drivers/tty/serial/8250/8250_mid.c

+3 −0
Original line number Diff line number Diff line
@@ -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)