From 9054605ab8468936a514298211d9e9bb68bf24bd Mon Sep 17 00:00:00 2001 From: "Jiri Slaby (SUSE)" Date: Fri, 5 Apr 2024 08:08:21 +0200 Subject: [PATCH] tty: 8250_omap: use dmaengine_prep_slave_sg() This is a preparatory for the serial-to-kfifo switch. kfifo understands only scatter-gatter approach, so switch to that. No functional change intended, it's just dmaengine_prep_slave_single() inline expanded. Signed-off-by: Jiri Slaby (SUSE) Link: https://lore.kernel.org/r/20240405060826.2521-11-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_omap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 66901d93089a3..879e77b307014 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -1140,6 +1140,7 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) struct omap8250_priv *priv = p->port.private_data; struct circ_buf *xmit = &p->port.state->xmit; struct dma_async_tx_descriptor *desc; + struct scatterlist sg; unsigned int skip_byte = 0; int ret; @@ -1191,9 +1192,11 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) skip_byte = 1; } - desc = dmaengine_prep_slave_single(dma->txchan, - dma->tx_addr + xmit->tail + skip_byte, - dma->tx_size - skip_byte, DMA_MEM_TO_DEV, + sg_init_table(&sg, 1); + sg_dma_address(&sg) = dma->tx_addr + xmit->tail + skip_byte; + sg_dma_len(&sg) = dma->tx_size - skip_byte; + + desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { ret = -EBUSY;