linux-kernel - [PATCH V4 01/15 net-next] qca_spi: Add check for kthread

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Message-Id: <20240128201059.6259-2-wahrenst@gmx.net>
Date: Sun, 28 Jan 2024 21:10:45 +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 01/15 net-next] qca_spi: Add check for kthread_stop

We better not rely on that spi_thread points to a running
thread. So add an check for this.

Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 5f3c11fb3fa2..77bab8bf5203 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -730,8 +730,10 @@ qcaspi_netdev_close(struct net_device *dev)
 	qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify);
 	free_irq(qca->spi_dev->irq, qca);

-	kthread_stop(qca->spi_thread);
-	qca->spi_thread = NULL;
+	if (qca->spi_thread) {
+		kthread_stop(qca->spi_thread);
+		qca->spi_thread = NULL;
+	}
 	qcaspi_flush_tx_ring(qca);

 	return 0;
--
2.34.1