linux-kernel - [PATCH 5.10 156/158] PCI/ERR: Retain status from error notification

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Date:   Tue, 23 Aug 2022 10:28:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hinko Kocevar <hinko.kocevar@....eu>,
        Hedi Berriche <hedi.berriche@....com>,
        Keith Busch <kbusch@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sean V Kelley <sean.v.kelley@...el.com>,
        Dominique Martinet <dominique.martinet@...ark-techno.com>
Subject: [PATCH 5.10 156/158] PCI/ERR: Retain status from error notification

From: Keith Busch <kbusch@...nel.org>

commit 387c72cdd7fb6bef650fb078d0f6ae9682abf631 upstream.

Overwriting the frozen detected status with the result of the link reset
loses the NEED_RESET result that drivers are depending on for error
handling to report the .slot_reset() callback. Retain this status so
that subsequent error handling has the correct flow.

Link: https://lore.kernel.org/r/20210104230300.1277180-4-kbusch@kernel.org
Reported-by: Hinko Kocevar <hinko.kocevar@....eu>
Tested-by: Hedi Berriche <hedi.berriche@....com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Sean V Kelley <sean.v.kelley@...el.com>
Acked-by: Hedi Berriche <hedi.berriche@....com>
Cc: Dominique Martinet <dominique.martinet@...ark-techno.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/pcie/err.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -196,8 +196,7 @@ pci_ers_result_t pcie_do_recovery(struct
 	pci_dbg(bridge, "broadcast error_detected message\n");
 	if (state == pci_channel_io_frozen) {
 		pci_walk_bridge(bridge, report_frozen_detected, &status);
-		status = reset_subordinates(bridge);
-		if (status != PCI_ERS_RESULT_RECOVERED) {
+		if (reset_subordinates(bridge) != PCI_ERS_RESULT_RECOVERED) {
 			pci_warn(bridge, "subordinate device reset failed\n");
 			goto failed;
 		}