USB: serial: f81534: fix division by zero on line-speed change
authorJohan Hovold <johan@kernel.org>
Tue, 29 Nov 2022 14:18:19 +0000 (15:18 +0100)
committerJohan Hovold <johan@kernel.org>
Wed, 30 Nov 2022 11:27:59 +0000 (12:27 +0100)
commit188c9c2e0c7f4ae864113f80c40bafb394062271
tree7c543518cbafc5d4ceea6347590eef9a06e0dac9
parenta08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888
USB: serial: f81534: fix division by zero on line-speed change

The driver leaves the line speed unchanged in case a requested speed is
not supported. Make sure to handle the case where the current speed is
B0 (hangup) without dividing by zero when determining the clock source.

Fixes: 3aacac02f385 ("USB: serial: f81534: add high baud rate support")
Cc: stable@vger.kernel.org # 4.16
Cc: Ji-Ze Hong (Peter Hong) <hpeter@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
drivers/usb/serial/f81534.c