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authorNiklas Schnelle <schnelle@linux.ibm.com>2020-08-04 14:01:26 +0300
committerHeiko Carstens <hca@linux.ibm.com>2020-08-17 14:17:05 +0300
commitb76fee1bc56c31a9d2a49592810eba30cc06d61a (patch)
tree1f1c9311b5522a8af2781918cf35fbd23fee353e /arch
parent0b8eb2ee9da1e8c9b8082f404f3948aa82a057b2 (diff)
downloadlinux-b76fee1bc56c31a9d2a49592810eba30cc06d61a.tar.xz
s390/pci: ignore stale configuration request event
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@vger.kernel.org> # 5.8 Reported-by: Shalini Chellathurai Saroja <shalini@linux.ibm.com> Tested-by: Shalini Chellathurai Saroja <shalini@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/pci/pci_event.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index fdebd286f402..4602068c7548 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);