5.4-stable review patch. If anyone has any objections, please let me know.
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From: John Keeping jkeeping@inmusicbrands.com
commit a26503092c75abba70a0be2aa01145ecf90c2a22 upstream.
When flushing transmit side DMA, it is the transmit channel that should be terminated, not the receive channel.
Fixes: 9e512eaaf8f40 ("serial: 8250: Fix fifo underflow on flush") Cc: stable stable@kernel.org Reported-by: Wentao Guan guanwentao@uniontech.com Signed-off-by: John Keeping jkeeping@inmusicbrands.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Link: https://lore.kernel.org/r/20250224121831.1429323-1-jkeeping@inmusicbrands.co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/8250/8250_dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/8250/8250_dma.c +++ b/drivers/tty/serial/8250/8250_dma.c @@ -139,7 +139,7 @@ void serial8250_tx_dma_flush(struct uart */ dma->tx_size = 0;
- dmaengine_terminate_async(dma->rxchan); + dmaengine_terminate_async(dma->txchan); }
int serial8250_rx_dma(struct uart_8250_port *p)