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| author | Johan Hovold <johan@kernel.org> | 2022-11-29 15:17:49 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2022-11-30 12:27:44 +0100 |
| commit | a08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888 (patch) | |
| tree | 7785f759a5a22cc95b2c211f3d9dc1f8cdd0a9ce /drivers/usb/serial | |
| parent | b7b275e60bcd5f89771e865a8239325f86d9927d (diff) | |
| download | linux-stable-a08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888.tar.gz linux-stable-a08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888.tar.bz2 linux-stable-a08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888.zip | |
USB: serial: f81232: 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: 268ddb5e9b62 ("USB: serial: f81232: add high baud rate support")
Cc: stable@vger.kernel.org # 5.2
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>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/f81232.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 2dd58cd9f0cc..891fb1fe69df 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -130,9 +130,6 @@ static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ, static int calc_baud_divisor(speed_t baudrate, speed_t clockrate) { - if (!baudrate) - return 0; - return DIV_ROUND_CLOSEST(clockrate, baudrate); } @@ -498,9 +495,14 @@ static void f81232_set_baudrate(struct tty_struct *tty, speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE }; for (i = 0; i < ARRAY_SIZE(baud_list); ++i) { - idx = f81232_find_clk(baud_list[i]); + baudrate = baud_list[i]; + if (baudrate == 0) { + tty_encode_baud_rate(tty, 0, 0); + return; + } + + idx = f81232_find_clk(baudrate); if (idx >= 0) { - baudrate = baud_list[i]; tty_encode_baud_rate(tty, baudrate, baudrate); break; } |