FAILED: patch "[PATCH] spi: sprd: fix controller deregistration" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 123d17dbc5f07059752fa5e616385ca29a8f935a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026051534-resale-vanity-d4b8@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 123d17dbc5f07059752fa5e616385ca29a8f935a Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Fri, 10 Apr 2026 10:17:46 +0200
Subject: [PATCH] spi: sprd: fix controller deregistration

Make sure to deregister the controller before disabling underlying resources like clocks during driver unbind.

Note that the controller is suspended before disabling and releasing resources since commit de082d866cce ("spi: sprd: Add the SPI irq function for the SPI DMA mode") which avoids issues like unclocked accesses but prevents SPI device drivers from doing I/O during deregistration.

index 0f9fc320363c..fd3fd0ce122c 100644
@@ -977,7 +977,7 @@ static int sprd_spi_probe(struct platform_device *pdev)
 		goto err_rpm_put;
 	}
 
-	ret = devm_spi_register_controller(&pdev->dev, sctlr);
+	ret = spi_register_controller(sctlr);
 	if (ret)
 		goto err_rpm_put;
 

@@ -1008,7 +1008,9 @@ static void sprd_spi_remove(struct platform_device *pdev)
 	if (ret < 0)
 		dev_err(ss->dev, "failed to resume SPI controller\n");
 
-	spi_controller_suspend(sctlr);
+	spi_controller_get(sctlr);
+
+	spi_unregister_controller(sctlr);
 
 	if (ret >= 0) {
 		if (ss->dma.enable)

@@ -1017,6 +1019,8 @@ static void sprd_spi_remove(struct platform_device *pdev)
 	}
 	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+
+	spi_controller_put(sctlr);
 }
 
 static int __maybe_unused sprd_spi_runtime_suspend(struct device *dev)