diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-07-01 17:21:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:07:38 +0200 |
| commit | d5d1383049c8d4ed1b906850175be2f547ba574e (patch) | |
| tree | f206dd080ba9a09284e06827a973df107ad76eef /drivers | |
| parent | 73c165a6f3828c61d2a0e725597ffc6e07c0c40b (diff) | |
serial: 8250_mid: fix divide error bug if baud rate is 0
commit 47b34d2ef266e2c283b514d65c8963c2ccd42474 upstream.
Since the commit c1a67b48f6a5 ("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: c1a67b48f6a5 ("serial: 8250_pci: replace switch-case by formula for Intel MID")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index ed489880e62b..83b3988eb6b2 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -149,6 +149,9 @@ 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) |