linux-kernel - [PATCH] serial: atmel: convert not to use dma_request_slave

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Message-Id: <f0522ae5a08a772268c901da6f74efe4ec2fe96c.1700407759.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 19 Nov 2023 16:29:39 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] serial: atmel: convert not to use dma_request_slave_channel()

dma_request_slave_channel() is deprecated. dma_request_chan() should
be used directly instead.

Switch to the preferred function and update the error handling accordingly.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/tty/serial/atmel_serial.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 1946fafc3f3e..a58cfaa87f1d 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1013,14 +1013,18 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
 	struct device *mfd_dev = port->dev->parent;
 	dma_cap_mask_t		mask;
 	struct dma_slave_config config;
+	struct dma_chan *chan;
 	int ret, nent;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	atmel_port->chan_tx = dma_request_slave_channel(mfd_dev, "tx");
-	if (atmel_port->chan_tx == NULL)
+	chan = dma_request_chan(mfd_dev, "tx");
+	if (IS_ERR(chan)) {
+		atmel_port->chan_tx = NULL;
 		goto chan_err;
+	}
+	atmel_port->chan_tx = chan;
 	dev_info(port->dev, "using %s for tx DMA transfers\n",
 		dma_chan_name(atmel_port->chan_tx));
 
-- 
2.34.1