spi: zynq-qspi: fix controller deregistration

[ Upstream commit c9c0127 ]

Make sure to deregister the controller before disabling it during driver
unbind.

Note that clocks were also disabled before the recent commit
1f8fd94 ("spi: zynq-qspi: Simplify clock handling with
devm_clk_get_enabled()").

Fixes: 67dca5e ("spi: spi-mem: Add support for Zynq QSPI controller")
Cc: stable@vger.kernel.org	# 5.2: 8eb2fd0
Cc: stable@vger.kernel.org	# 5.2
Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260410081757.503099-27-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jhovold

drivers/spi/spi-zynq-qspi.c

@@ -641,7 +641,7 @@ static int zynq_qspi_probe(struct platform_device *pdev)
 
 	xqspi = spi_controller_get_devdata(ctlr);
 	xqspi->dev = dev;
-	platform_set_drvdata(pdev, xqspi);
+	platform_set_drvdata(pdev, ctlr);
 	xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(xqspi->regs)) {
 		ret = PTR_ERR(xqspi->regs);
@@ -699,9 +699,9 @@ static int zynq_qspi_probe(struct platform_device *pdev)
 	/* QSPI controller initializations */
 	zynq_qspi_init_hw(xqspi, ctlr->num_chipselect);
 
-	ret = devm_spi_register_controller(&pdev->dev, ctlr);
+	ret = spi_register_controller(ctlr);
 	if (ret) {
-		dev_err(&pdev->dev, "devm_spi_register_controller failed\n");
+		dev_err(&pdev->dev, "failed to register controller\n");
 		goto remove_ctlr;
 	}
 
@@ -725,9 +725,16 @@ static int zynq_qspi_probe(struct platform_device *pdev)
  */
 static void zynq_qspi_remove(struct platform_device *pdev)
 {
-	struct zynq_qspi *xqspi = platform_get_drvdata(pdev);
+	struct spi_controller *ctlr = platform_get_drvdata(pdev);
+	struct zynq_qspi *xqspi = spi_controller_get_devdata(ctlr);
+
+	spi_controller_get(ctlr);
+
+	spi_unregister_controller(ctlr);
 
 	zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET, 0);
+
+	spi_controller_put(ctlr);
 }
 
 static const struct of_device_id zynq_qspi_of_match[] = {