diff options
| -rw-r--r-- | hw/char/sifive_uart.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/hw/char/sifive_uart.c b/hw/char/sifive_uart.c index 138c31fcab..401f869680 100644 --- a/hw/char/sifive_uart.c +++ b/hw/char/sifive_uart.c @@ -122,7 +122,9 @@ static void sifive_uart_write_tx_fifo(SiFiveUARTState *s, const uint8_t *buf, qemu_log_mask(LOG_GUEST_ERROR, "sifive_uart: TX FIFO overflow"); } - fifo8_push_all(&s->tx_fifo, buf, size); + if (size > 0) { + fifo8_push_all(&s->tx_fifo, buf, size); + } if (fifo8_is_full(&s->tx_fifo)) { s->txfifo |= SIFIVE_UART_TXFIFO_FULL; |