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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2020-08-04 14:01:26 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2020-08-17 14:17:05 +0300 |
| commit | b76fee1bc56c31a9d2a49592810eba30cc06d61a (patch) | |
| tree | 1f1c9311b5522a8af2781918cf35fbd23fee353e /arch/s390/pci/pci_event.c | |
| parent | 0b8eb2ee9da1e8c9b8082f404f3948aa82a057b2 (diff) | |
| download | linux-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/s390/pci/pci_event.c')
| -rw-r--r-- | arch/s390/pci/pci_event.c | 3 |
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); |