[PATCH RESEND 5/8] serial: 8250: reject delaying RTS with RS485
From: Wolfram Sang <hidden>
Date: 2011-12-09 17:07:39
Also in:
lkml
Subsystem:
8250/16?50 (and clone uarts) serial driver, the rest, tty layer and serial drivers · Maintainers:
Greg Kroah-Hartman, Linus Torvalds, Jiri Slaby
There might be chips capable of doing this, but for now nothing is implemented, so reject usage of this feature. Signed-off-by: Wolfram Sang <redacted> --- drivers/tty/serial/8250.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 6a2f47f..28b3608 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c@@ -2735,6 +2735,9 @@ static int serial8250_ioctl_port(struct uart_port *port, sizeof(rs485ctrl))) return -EFAULT; + if (rs485ctrl.delay_rts_before_send || rs485ctrl.delay_rts_after_send) + return -EOPNOTSUPP; + spin_lock_irqsave(&up->port.lock, flags); lcr = serial_inp(up, UART_LCR); serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
--
1.7.7.3