FAILED: patch "[PATCH] s390/pci: Remove redundant bus removal and disable from" failed to apply to 6.1-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.1-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-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x d76f9633296785343d45f85199f4138cb724b6d2
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025062039-unnerving-tasting-63f1@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From d76f9633296785343d45f85199f4138cb724b6d2 Mon Sep 17 00:00:00 2001
From: Niklas Schnelle <schnelle@linux.ibm.com>
Date: Thu, 22 May 2025 14:13:12 +0200
Subject: [PATCH] s390/pci: Remove redundant bus removal and disable from
 zpci_release_device()

Remove zpci_bus_remove_device() and zpci_disable_device() calls from
zpci_release_device(). These calls were done when the device
transitioned into the ZPCI_FN_STATE_STANDBY state which is guaranteed to
happen before it enters the ZPCI_FN_STATE_RESERVED state. When
zpci_release_device() is called the device is known to be in the
ZPCI_FN_STATE_RESERVED state which is also checked by a WARN_ON().

Cc: stable@vger.kernel.org
Fixes: a46044a92add ("s390/pci: fix zpci_zdev_put() on reserve")
Reviewed-by: Gerd Bayer <gbayer@linux.ibm.com>
Reviewed-by: Julian Ruess <julianr@linux.ibm.com>
Tested-by: Gerd Bayer <gbayer@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 5bbdc4190b8b..9fcc6d3180f2 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -949,12 +949,6 @@ void zpci_release_device(struct kref *kref)
 
 	WARN_ON(zdev->state != ZPCI_FN_STATE_RESERVED);
 
-	if (zdev->zbus->bus)
-		zpci_bus_remove_device(zdev, false);
-
-	if (zdev_enabled(zdev))
-		zpci_disable_device(zdev);
-
 	if (zdev->has_hp_slot)
 		zpci_exit_slot(zdev);