cadance_uart: Accept input after rx FIFO pop

The device returns false from the can receive function when the FIFO is
full. This means the device should check for buffered input whenever a byte is
popped from the FIFO.

Reported-by: Jason Wu <huanyu@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1360632571-25638-1-git-send-email-peter.crosthwaite@xilinx.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/cadence_uart.c

@@ -343,6 +343,7 @@ static void uart_read_rx_fifo(UartState *s, uint32_t *c)
         if (!s->rx_count) {
             s->r[R_SR] |= UART_SR_INTR_REMPTY;
         }
+        qemu_chr_accept_input(s->chr);
     } else {
         *c = 0;
         s->r[R_SR] |= UART_SR_INTR_REMPTY;