summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-07-01 17:21:49 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-24 10:07:38 +0200
commitd5d1383049c8d4ed1b906850175be2f547ba574e (patch)
treef206dd080ba9a09284e06827a973df107ad76eef /drivers
parent73c165a6f3828c61d2a0e725597ffc6e07c0c40b (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.c3
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)