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drivers: spi: stm32: Fix race condition causing lockup in half-duplex mode #94957

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drivers: spi: stm32: Fix race condition causing lockup in half-duplex mode #94957

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9 changes: 8 additions & 1 deletion drivers/spi/spi_ll_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -876,7 +876,14 @@ static int spi_stm32_half_duplex_switch_to_receive(const struct spi_stm32_config
if (LL_SPI_GetMode(spi) == LL_SPI_MODE_MASTER) {
LL_SPI_StartMasterTransfer(spi);
while (!LL_SPI_IsActiveMasterTransfer(spi)) {
/* NOP */
/*
* Check for the race condition where the transfer completes
* before this loop is entered. If EOT is set, the transfer
* is done and we can break.
*/
if (LL_SPI_IsActiveFlag_EOT(spi)) {
break;
}
}
}
#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32h7_spi) */
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