zephyr: Remove irq locking since ringbuf is inherently thread safe.

Signed-off-by: Daniel Campora <[email protected]>

Author: danicampora

ports/zephyr/machine_uart.c

@@ -31,7 +31,6 @@
 
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/uart.h>
-#include <zephyr/irq.h>
 
 #include "py/mperrno.h"
 #include "py/obj.h"
@@ -189,7 +188,7 @@ static mp_int_t mp_machine_uart_any(machine_uart_obj_t *self) {
 }
 
 static bool mp_machine_uart_txdone(machine_uart_obj_t *self) {
-    return (ringbuf_avail(&self->tx_ringbuffer) || (self->tx_complete == false)) ? false : true;
+    return self->tx_complete && !ringbuf_avail(&self->tx_ringbuffer) ? true : false;
 }
 
 static mp_uint_t mp_machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
@@ -202,9 +201,7 @@ static mp_uint_t mp_machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t
     do {
         int _rx_len = MIN(ringbuf_avail(&self->rx_ringbuffer), size - bytes_read);
         if (_rx_len > 0) {
-            uint32_t key = irq_lock();
             ringbuf_get_bytes(&self->rx_ringbuffer, &buffer[bytes_read], _rx_len);
-            irq_unlock(key);
             bytes_read += _rx_len;
             elapsed_ms = 0;
             time_to_wait = self->timeout_char;