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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-07-01 17:21:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 15:49:26 +0200 |
| commit | 47b34d2ef266e2c283b514d65c8963c2ccd42474 (patch) | |
| tree | ec910c61003dab6343d9e9ff9fcab560e3e29d6d /drivers/tty/serial/8250/8250_mid.c | |
| parent | 5db4f7f80d165fc9725f356e99feec409e446baa (diff) | |
| download | blackbird-op-linux-47b34d2ef266e2c283b514d65c8963c2ccd42474.tar.gz blackbird-op-linux-47b34d2ef266e2c283b514d65c8963c2ccd42474.zip | |
serial: 8250_mid: fix divide error bug if baud rate is 0
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")
Cc: stable@vger.kernel.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250_mid.c')
| -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 339de9cd0866..20c5db2f4264 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -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) |
