s5j/serial: refactor up_rxavailable()

When determining the availability of Rx FIFO, combining UFSTAT[8] and
UFSTAT[7:0] looks more tidy and clean.

Change-Id: I1b35dd2afae710375c0bf616f7eeae615fdb8cd6
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>

diff --git a/os/arch/arm/src/s5j/s5j_serial.c b/os/arch/arm/src/s5j/s5j_serial.c
index 089ed7a..4f72d15 100644 (file)
--- a/os/arch/arm/src/s5j/s5j_serial.c
+++ b/os/arch/arm/src/s5j/s5j_serial.c
@@ -631,8 +631,8 @@ static bool up_rxavailable(struct uart_dev_s *dev)
        struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
        uint32_t ufstat = uart_getreg32(priv, S5J_UART_UFSTAT_OFFSET);
 
-       return !!(ufstat & UART_UFSTAT_RX_FIFO_COUNT_MASK) ||
-                               (ufstat & UART_UFSTAT_RX_FIFO_FULL_MASK);
+       return !!(ufstat & (UART_UFSTAT_RX_FIFO_COUNT_MASK |
+                                               UART_UFSTAT_RX_FIFO_FULL_MASK));
 }
 
 /****************************************************************************