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tty: 8250_dma: use dmaengine_prep_slave_sg()

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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) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240405060826.2521-10-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2024-04-05 08:08:20 +02:00 committed by Greg Kroah-Hartman
parent 2ab682d221
commit 8192fabb0d
1 changed files with 8 additions and 4 deletions
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12
drivers/tty/serial/8250/8250_dma.c
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@ -89,6 +89,7 @@ int serial8250_tx_dma(struct uart_8250_port *p)
struct circ_buf *xmit = &p->port.state->xmit;
struct dma_async_tx_descriptor *desc;
struct uart_port *up = &p->port;
struct scatterlist sg;
int ret;
if (dma->tx_running) {
@ -111,10 +112,13 @@ int serial8250_tx_dma(struct uart_8250_port *p)
serial8250_do_prepare_tx_dma(p);
desc = dmaengine_prep_slave_single(dma->txchan,
dma->tx_addr + xmit->tail,
dma->tx_size, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
sg_init_table(&sg, 1);
sg_dma_address(&sg) = dma->tx_addr + xmit->tail;
sg_dma_len(&sg) = dma->tx_size;
desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
ret = -EBUSY;
goto err;