s390/pci: improve handling of hotplug event 0x301

Hypervisors may deliver event 0x301 not only for standby
but also for reserved devices.
Just handle event 0x301 regardless of the device's state.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index 460fdb21cf61..ed2394dd14e9 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -75,7 +75,13 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
         zpci_err_hex(ccdf, sizeof(*ccdf));
 
         switch (ccdf->pec) {
-        case 0x0301: /* Standby -> Configured */
+        case 0x0301: /* Reserved|Standby -> Configured */
+                if (!zdev) {
+                        ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
+                        if (ret)
+                                break;
+                        zdev = get_zdev_by_fid(ccdf->fid);
+                }
                 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
                         break;
                 zdev->state = ZPCI_FN_STATE_CONFIGURED;