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Subject[PATCH 36/36] serial: 8250: Remove serial_rs485 sanitization from em485
Date
Serial core handles serial_rs485 sanitization.

When em485 init fails, there are two possible paths of entry:

1) uart_rs485_config (init path) that fully clears port->rs485 on
error.

2) ioctl path with a pre-existing, valid port->rs485 unto which the
kernel falls back on error and port->rs485 should therefore be
kept untouched. The temporary rs485 struct is not returned to
userspace in case of error so its flag don't matter.

...Thus SER_RS485_ENABLED clearing on error can/should be dropped.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
drivers/tty/serial/8250/8250_port.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index a825fbc215a7..4998799abae2 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -675,13 +675,6 @@ int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485)
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;
-
gpiod_set_value(port->rs485_term_gpio,
rs485->flags & SER_RS485_TERMINATE_BUS);

@@ -689,15 +682,8 @@ int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485)
* Both serial8250_em485_init() and serial8250_em485_destroy()
* are idempotent.
*/
- if (rs485->flags & SER_RS485_ENABLED) {
- int ret = serial8250_em485_init(up);
-
- if (ret) {
- rs485->flags &= ~SER_RS485_ENABLED;
- port->rs485.flags &= ~SER_RS485_ENABLED;
- }
- return ret;
- }
+ if (rs485->flags & SER_RS485_ENABLED)
+ return serial8250_em485_init(up);

serial8250_em485_destroy(up);
return 0;
--
2.30.2
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