From: Lukas Wunner Date: Fri, 28 Feb 2020 13:31:04 +0000 (+0100) Subject: serial: 8250: Sanitize rs485 config harder X-Git-Tag: Ubuntu-5.10.0-12.13~3214^2~77 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=6d3e54e1955ed1cd2da9a90c944290e91772cbcb;p=mirror_ubuntu-hirsute-kernel.git serial: 8250: Sanitize rs485 config harder Amend the generic ->rs485_config() callback to sanitize RTS polarity and zero-fill the padding (in addition to the existing sanitization of the RTS delays). Signed-off-by: Lukas Wunner Cc: Matwey V. Kornilov Link: https://lore.kernel.org/r/ff833721bc372d38678f289eb2a44dbf016d5203.1582895077.git.lukas@wunner.de Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 73244806d701..d281aea061d6 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -676,10 +676,18 @@ int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485) { struct uart_8250_port *up = up_to_u8250p(port); + /* pick sane settings if the user hasn't */ + if (!!(rs485->flags & SER_RS485_RTS_ON_SEND) == + !!(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { + rs485->flags |= SER_RS485_RTS_ON_SEND; + rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; + } + /* clamp the delays to [0, 100ms] */ rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U); rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U); + memset(rs485->padding, 0, sizeof(rs485->padding)); port->rs485 = *rs485; /*