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diff --git a/sys/dev/uart/uart_dev_ns8250.c b/sys/dev/uart/uart_dev_ns8250.c
--- a/sys/dev/uart/uart_dev_ns8250.c
+++ b/sys/dev/uart/uart_dev_ns8250.c
@@ -232,7 +232,7 @@
* https://github.com/rust-vmm/vm-superio/issues/83
*/
lsr = uart_getreg(bas, REG_LSR);
- if ((lsr & LSR_TEMT) && (what & UART_FLUSH_TRANSMITTER))
+ if (((lsr & LSR_TEMT) == 0) && (what & UART_FLUSH_TRANSMITTER))
drain |= UART_DRAIN_TRANSMITTER;
if ((lsr & LSR_RXRDY) && (what & UART_FLUSH_RECEIVER))
drain |= UART_DRAIN_RECEIVER;

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