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@gmx.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 5f3c11f..77bab8b 100644 (file)
--- 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;