FAILED: patch "[PATCH] spi: cadence: fix unclocked access on unbind" 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 5b1689a41f02955c5361944f748a4812a6ff9307
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026051530-till-rumble-6ea8@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 5b1689a41f02955c5361944f748a4812a6ff9307 Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Tue, 21 Apr 2026 14:36:12 +0200
Subject: [PATCH] spi: cadence: fix unclocked access on unbind

Make sure that the controller is runtime resumed before disabling it during driver unbind to avoid unclocked register access and unbalanced clock disable.

Also restore the autosuspend setting.

This issue was flagged by Sashiko when reviewing a controller deregistration fix.

index 08d7dabe818d..bf4a7cf6b142 100644
@@ -776,16 +776,23 @@ static void cdns_spi_remove(struct platform_device *pdev)
 {
 	struct spi_controller *ctlr = platform_get_drvdata(pdev);
 	struct cdns_spi *xspi = spi_controller_get_devdata(ctlr);
+	int ret = 0;
+
+	if (!spi_controller_is_target(ctlr))
+		ret = pm_runtime_get_sync(&pdev->dev);
 
 	spi_controller_get(ctlr);
 
 	spi_unregister_controller(ctlr);
 
-	cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
+	if (ret >= 0)
+		cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE);
 
 	if (!spi_controller_is_target(ctlr)) {
 		pm_runtime_disable(&pdev->dev);
 		pm_runtime_set_suspended(&pdev->dev);
+		pm_runtime_put_noidle(&pdev->dev);
+		pm_runtime_dont_use_autosuspend(&pdev->dev);
 	}
 
 	spi_controller_put(ctlr);