FAILED: patch "[PATCH] PCI/ERR: Fix uevent on failure to recover" failed to apply to 5.4-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.4-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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 1cbc5e25fb70e942a7a735a1f3d6dd391afc9b29
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025101610-deserve-skittle-9bde@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 1cbc5e25fb70e942a7a735a1f3d6dd391afc9b29 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Wed, 13 Aug 2025 07:11:02 +0200
Subject: [PATCH] PCI/ERR: Fix uevent on failure to recover

Upon failure to recover from a PCIe error through AER, DPC or EDR, a
uevent is sent to inform user space about disconnection of the bridge
whose subordinate devices failed to recover.

However the bridge itself is not disconnected.  Instead, a uevent should
be sent for each of the subordinate devices.

Only if the "bridge" happens to be a Root Complex Event Collector or
Integrated Endpoint does it make sense to send a uevent for it (because
there are no subordinate devices).

Right now if there is a mix of subordinate devices with and without
pci_error_handlers, a BEGIN_RECOVERY event is sent for those with
pci_error_handlers but no FAILED_RECOVERY event is ever sent for them
afterwards.  Fix it.

Fixes: 856e1eb9bdd4 ("PCI/AER: Add uevents in AER and EEH error/resume")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org  # v4.16+
Link: https://patch.msgid.link/68fc527a380821b5d861dd554d2ce42cb739591c.1755008151.git.lukas@wunner.de

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index e795e5ae6b03..21d554359fb1 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -108,6 +108,12 @@ static int report_normal_detected(struct pci_dev *dev, void *data)
 	return report_error_detected(dev, pci_channel_io_normal, data);
 }
 
+static int report_perm_failure_detected(struct pci_dev *dev, void *data)
+{
+	pci_uevent_ers(dev, PCI_ERS_RESULT_DISCONNECT);
+	return 0;
+}
+
 static int report_mmio_enabled(struct pci_dev *dev, void *data)
 {
 	struct pci_driver *pdrv;
@@ -272,7 +278,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 failed:
 	pci_walk_bridge(bridge, pci_pm_runtime_put, NULL);
 
-	pci_uevent_ers(bridge, PCI_ERS_RESULT_DISCONNECT);
+	pci_walk_bridge(bridge, report_perm_failure_detected, NULL);
 
 	pci_info(bridge, "device recovery failed\n");