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

Since the commit c1a67b48f6 ("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: "Mendez Salinas, Fernando" <fernando.mendez.salinas@intel.com>
Fixes: c1a67b48f6 ("serial: 8250_pci: replace switch-case by formula for Intel MID")
Cc: stable@vger.kernel.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2016-07-01 17:21:49 +03:00 committed by Greg Kroah-Hartman
parent 5db4f7f80d
commit 47b34d2ef2
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/8250/8250_mid.c
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@ -168,6 +168,9 @@ static void mid8250_set_termios(struct uart_port *p,
unsigned long w = BIT(24) - 1; unsigned long w = BIT(24) - 1;
unsigned long mul, div; unsigned long mul, div;
/* Gracefully handle the B0 case: fall back to B9600 */
fuart = fuart ? fuart : 9600 * 16;
if (mid->board->freq < fuart) { if (mid->board->freq < fuart) {
/* Find prescaler value that satisfies Fuart < Fref */ /* Find prescaler value that satisfies Fuart < Fref */
if (mid->board->freq > baud) if (mid->board->freq > baud)