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serial: 8250: Remove serial_rs485 sanitization from em485 

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>
Link: https://lore.kernel.org/r/20220606100433.13793-37-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-06-06 13:04:33 +03:00 committed by Greg Kroah-Hartman
parent bbdcbc1301
commit 84f2faa785
1 changed files with 2 additions and 16 deletions
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18
drivers/tty/serial/8250/8250_port.c
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@ -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;