FAILED: patch "[PATCH] spi: dln2: fix controller deregistration" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

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 <stable@vger.kernel.org>.

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 c353020fbfa8514ee91a6de2d88de4e5edca5803
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026051504-revolt-yiddish-d9b1@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From c353020fbfa8514ee91a6de2d88de4e5edca5803 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Thu, 9 Apr 2026 14:04:10 +0200
Subject: [PATCH] spi: dln2: fix controller deregistration

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

Fixes: 3d8c0d749da3 ("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>

diff --git a/drivers/spi/spi-dln2.c b/drivers/spi/spi-dln2.c
index d90282960ab6..392f0d05f508 100644
--- a/drivers/spi/spi-dln2.c
+++ b/drivers/spi/spi-dln2.c
@@ -758,7 +758,7 @@ 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;
@@ -783,10 +783,16 @@ 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