In a mixed DMA/IRQ use-case (e.g.: DMA for TX, IRQ for RX), interrupt
handler might try to handle Rx/Tx condition it shouldn't. Change the
code to only handle TX/RX event if corresponding path isn't being
handled by DMA.
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
Cc: Stefan Agner <ste...@agner.ch>
Cc: Bhuvanchandra DV <bhuvanchandra...@toradex.com>
Cc: Chris Healy <cphe...@gmail.com>
Cc: Cory Tusar <cory.tu...@zii.aero>
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Jiri Slaby <jsl...@suse.com>
Cc: linux-...@nxp.com
Cc: linux-ser...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/tty/serial/fsl_lpuart.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 53b98065f9c5..b74027964b45 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -966,10 +966,10 @@ static irqreturn_t lpuart_int(int irq, void *dev_id)
sts = readb(sport->port.membase + UARTSR1);
- if (sts & UARTSR1_RDRF)
+ if (sts & UARTSR1_RDRF && !sport->lpuart_dma_rx_use)
lpuart_rxint(sport);
- if (sts & UARTSR1_TDRE)
+ if (sts & UARTSR1_TDRE && !sport->lpuart_dma_tx_use)
lpuart_txint(sport);
return IRQ_HANDLED;
--
2.21.0
