[SRU][F][PATCH 1/1] s390/pci: ignore stale configuration request event

[frank.heimes at canonical.com]

From: Niklas Schnelle <schnelle at linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1893778

A configuration request event may be stale, that is the event
may reference a zdev which was already configured.
This can happen when a hotplug happens during boot such that
the device is discovered and configured in the initial clp_list_pci(),
then after initialization we enable events and process
the original configuration request which additionally still contains
the old disabled function handle leading to a failure during device
enablement and subsequent I/O lockout.

Fix this by restoring the check that the device to be configured is in
standby which was removed in commit f606b3ef47c9 ("s390/pci: adapt events
for zbus").

This check does not need serialization as we only enable the events after
zPCI has fully initialized, which includes the initial clp_list_pci(),
rescan only does updates and events are serialized with respect to each
other.

Fixes: f606b3ef47c9 ("s390/pci: adapt events for zbus")
Cc: <stable at vger.kernel.org> # 5.8
Reported-by: Shalini Chellathurai Saroja <shalini at linux.ibm.com>
Tested-by: Shalini Chellathurai Saroja <shalini at linux.ibm.com>
Acked-by: Pierre Morel <pmorel at linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle at linux.ibm.com>
Signed-off-by: Heiko Carstens <hca at linux.ibm.com>
(cherry picked from commit b76fee1bc56c31a9d2a49592810eba30cc06d61a)
Signed-off-by: Frank Heimes <frank.heimes at canonical.com>
---
 arch/s390/pci/pci_event.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index 538da3faa048..9a3a291cad43 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -92,6 +92,9 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
 			ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 1);
 			break;
 		}
+		/* the configuration request may be stale */
+		if (zdev->state != ZPCI_FN_STATE_STANDBY)
+			break;
 		zdev->fh = ccdf->fh;
 		zdev->state = ZPCI_FN_STATE_CONFIGURED;
 		ret = zpci_enable_device(zdev);
-- 
2.25.1