fix(mmio): read data pointer after waiting for line status

Signed-off-by: Martin Kröning <[email protected]>

Author: mkroening

src/mmio.rs

@@ -90,20 +90,18 @@ impl MmioSerialPort {
 
     /// Sends a raw byte on the serial port, intended for binary data.
     pub fn send_raw(&mut self, data: u8) {
-        let self_data = self.data.load(Ordering::Relaxed);
         wait_for!(self.line_sts().contains(LineStsFlags::OUTPUT_EMPTY));
+        let self_data = self.data.load(Ordering::Relaxed);
         unsafe {
             self_data.write(data);
         }
     }
 
     /// Receives a byte on the serial port.
     pub fn receive(&mut self) -> u8 {
+        wait_for!(self.line_sts().contains(LineStsFlags::INPUT_FULL));
         let self_data = self.data.load(Ordering::Relaxed);
-        unsafe {
-            wait_for!(self.line_sts().contains(LineStsFlags::INPUT_FULL));
-            self_data.read()
-        }
+        unsafe { self_data.read() }
     }
 }