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USB: serial: f81232: fix division by zero on line-speed change

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commit a08ca6ebafe615c9028c53fc4c9e6c9b2b1f2888 upstream.

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: 268ddb5e9b ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2022-11-29 15:17:49 +01:00 committed by Greg Kroah-Hartman
parent fe0f214385
commit 0d6bf63eb3
1 changed files with 7 additions and 5 deletions
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12
drivers/usb/serial/f81232.c
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@ -78,9 +78,6 @@ 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);
}
@ -423,9 +420,14 @@ 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]);
if (idx >= 0) {
baudrate = baud_list[i];
if (baudrate == 0) {
tty_encode_baud_rate(tty, 0, 0);
return;
}
idx = f81232_find_clk(baudrate);
if (idx >= 0) {
tty_encode_baud_rate(tty, baudrate, baudrate);
break;
}