linux-kernel - [PATCH V4 03/15 net-next] qca_spi: Improve SPI IRQ handling

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Message-Id: <20240128201059.6259-4-wahrenst@gmx.net>
Date: Sun, 28 Jan 2024 21:10:47 +0100
From: Stefan Wahren <wahrenst@....net>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Lino Sanfilippo <LinoSanfilippo@....de>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stefan Wahren <wahrenst@....net>,
	Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH V4 03/15 net-next] qca_spi: Improve SPI IRQ handling

The functions qcaspi_netdev_open/close are responsible of request &
free of the SPI interrupt, which wasn't the best choice because
allocation problems are discovered not during probe. So let us split
IRQ allocation & enabling, so we can take advantage of a device
managed IRQ.

Signed-off-by: Stefan Wahren <wahrenst@....net>
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index fe50c2dd7cc8..3f7e38a11ba0 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -688,7 +688,6 @@ qcaspi_netdev_open(struct net_device *dev)
 {
 	struct qcaspi *qca = netdev_priv(dev);
 	struct task_struct *thread;
-	int ret = 0;

 	if (!qca)
 		return -EINVAL;
@@ -709,14 +708,7 @@ qcaspi_netdev_open(struct net_device *dev)

 	qca->spi_thread = thread;

-	ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0,
-			  dev->name, qca);
-	if (ret) {
-		netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n",
-			   QCASPI_DRV_NAME, qca->spi_dev->irq, ret);
-		kthread_stop(qca->spi_thread);
-		return ret;
-	}
+	enable_irq(qca->spi_dev->irq);

 	/* SPI thread takes care of TX queue */

@@ -731,7 +723,7 @@ qcaspi_netdev_close(struct net_device *dev)
 	netif_stop_queue(dev);

 	qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify);
-	free_irq(qca->spi_dev->irq, qca);
+	disable_irq(qca->spi_dev->irq);

 	if (qca->spi_thread) {
 		kthread_stop(qca->spi_thread);
@@ -989,6 +981,15 @@ qca_spi_probe(struct spi_device *spi)

 	spi_set_drvdata(spi, qcaspi_devs);

+	ret = devm_request_irq(&spi->dev, spi->irq, qcaspi_intr_handler,
+			       IRQF_NO_AUTOEN, qca->net_dev->name, qca);
+	if (ret) {
+		dev_err(&spi->dev, "Unable to get IRQ %d (irqval=%d).\n",
+			spi->irq, ret);
+		free_netdev(qcaspi_devs);
+		return ret;
+	}
+
 	ret = of_get_ethdev_address(spi->dev.of_node, qca->net_dev);
 	if (ret) {
 		eth_hw_addr_random(qca->net_dev);
--
2.34.1