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USB: serial: cp210x: disable interface on errors in open

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Try to disable the serial interface in the unlikely event that generic
open() fails.

Link: https://lore.kernel.org/r/20200713105517.27796-2-johan@kernel.org
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2020-07-13 12:55:13 +02:00
parent eb0c68ea42
commit bcbb9d812e
1 changed files with 10 additions and 1 deletions
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11
drivers/usb/serial/cp210x.c
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@ -824,7 +824,16 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
if (tty)
cp210x_change_speed(tty, port, NULL);
return usb_serial_generic_open(tty, port);
result = usb_serial_generic_open(tty, port);
if (result)
goto err_disable;
return 0;
err_disable:
cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
return result;
}
static void cp210x_close(struct usb_serial_port *port)