linux-kernel - [PATCH V4 02/15 net-next] qca_spi: Improve SPI thread creation

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Date: Sun, 28 Jan 2024 21:10:46 +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>
Subject: [PATCH V4 02/15 net-next] qca_spi: Improve SPI thread creation

Directly storing the result of kthread_run within the private
driver data makes it harder to identify if the pointer has a
running thread or not. So better use a local variable for
the result check and we don't have to care about error pointer
in the rest of the code.

Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 77bab8bf5203..fe50c2dd7cc8 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -687,6 +687,7 @@ static int
 qcaspi_netdev_open(struct net_device *dev)
 {
 	struct qcaspi *qca = netdev_priv(dev);
+	struct task_struct *thread;
 	int ret = 0;

 	if (!qca)
@@ -697,15 +698,17 @@ qcaspi_netdev_open(struct net_device *dev)
 	qca->sync = QCASPI_SYNC_UNKNOWN;
 	qcafrm_fsm_init_spi(&qca->frm_handle);

-	qca->spi_thread = kthread_run((void *)qcaspi_spi_thread,
-				      qca, "%s", dev->name);
+	thread = kthread_run((void *)qcaspi_spi_thread,
+			     qca, "%s", dev->name);

-	if (IS_ERR(qca->spi_thread)) {
+	if (IS_ERR(thread)) {
 		netdev_err(dev, "%s: unable to start kernel thread.\n",
 			   QCASPI_DRV_NAME);
-		return PTR_ERR(qca->spi_thread);
+		return PTR_ERR(thread);
 	}

+	qca->spi_thread = thread;
+
 	ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0,
 			  dev->name, qca);
 	if (ret) {
--
2.34.1