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drivers: uart: stm32: don't allow async TX on a suspended UART #98014

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Merged
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Oct 23, 2025
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drivers: uart: stm32: don't allow async TX on a suspended UART #98014

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9 changes: 9 additions & 0 deletions drivers/serial/uart_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1675,6 +1675,15 @@ static int uart_stm32_async_tx(const struct device *dev,
__maybe_unused unsigned int key;
int ret;

#if defined(CONFIG_PM_DEVICE)
enum pm_device_state state;

(void)pm_device_state_get(dev, &state);
if (state != PM_DEVICE_STATE_ACTIVE) {
return -ECANCELED;
}
#endif

/* Check size of singl character (1 or 2 bytes) */
const int char_size = (IS_ENABLED(CONFIG_UART_WIDE_DATA) &&
(LL_USART_GetDataWidth(usart) == LL_USART_DATAWIDTH_9B) &&
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