spi: dln2: fix controller deregistration

commit c353020 upstream.

Make sure to deregister the controller before disabling it to allow
SPI device drivers to do I/O during deregistration.

Fixes: 3d8c0d7 ("spi: add support for DLN-2 USB-SPI adapter")
Cc: stable@vger.kernel.org	# 4.0
Cc: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260409120419.388546-12-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jhovold

drivers/spi/spi-dln2.c

@@ -761,7 +761,7 @@ static int dln2_spi_probe(struct platform_device *pdev)
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	ret = devm_spi_register_controller(&pdev->dev, host);
+	ret = spi_register_controller(host);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register host\n");
 		goto exit_register;
@@ -786,10 +786,16 @@ static void dln2_spi_remove(struct platform_device *pdev)
 	struct spi_controller *host = platform_get_drvdata(pdev);
 	struct dln2_spi *dln2 = spi_controller_get_devdata(host);
 
+	spi_controller_get(host);
+
+	spi_unregister_controller(host);
+
 	pm_runtime_disable(&pdev->dev);
 
 	if (dln2_spi_enable(dln2, false) < 0)
 		dev_err(&pdev->dev, "Failed to disable SPI module\n");
+
+	spi_controller_put(host);
 }
 
 #ifdef CONFIG_PM_SLEEP