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authorAlan Cox <alan@linux.intel.com>2010-01-04 11:26:21 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-20 18:03:29 -0500
commit16ae2a877bf4179737921235e85ceffd7b79354f (patch)
tree48a72ef071d1c89dc6d49aa88bb3ee98af6ce7ad /drivers
parent4547be7809a3b775ce750ec7f8b5748954741523 (diff)
serial: Fix crash if the minimum rate of the device is > 9600 baud
In that situation if the old rate is invalid and the new rate is invalid and the chip cannot do 9600 baud we report zero, which makes all the drivers explode. Instead force the rate based on min/max Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/serial/serial_core.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index fa4f170f2e86..7f2830709512 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -385,13 +385,20 @@ uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
385 } 385 }
386 386
387 /* 387 /*
388 * As a last resort, if the quotient is zero, 388 * As a last resort, if the range cannot be met then clip to
389 * default to 9600 bps 389 * the nearest chip supported rate.
390 */ 390 */
391 if (!hung_up) 391 if (!hung_up) {
392 tty_termios_encode_baud_rate(termios, 9600, 9600); 392 if (baud <= min)
393 tty_termios_encode_baud_rate(termios,
394 min + 1, min + 1);
395 else
396 tty_termios_encode_baud_rate(termios,
397 max - 1, max - 1);
398 }
393 } 399 }
394 400 /* Should never happen */
401 WARN_ON(1);
395 return 0; 402 return 0;
396} 403}
397 404