s390/pci: return error after failed pci ops

Access to pci config space via pci_ops should not fail silently.

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, 12 insertions, 4 deletions

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 51d16f1fb5ea..6a054bf83eb0 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -405,20 +405,28 @@ static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
                     int size, u32 *val)
 {
         struct zpci_dev *zdev = get_zdev_by_bus(bus);
+        int ret;
 
         if (!zdev || devfn != ZPCI_DEVFN)
-                return 0;
-        return zpci_cfg_load(zdev, where, val, size);
+                ret = -ENODEV;
+        else
+                ret = zpci_cfg_load(zdev, where, val, size);
+
+        return ret;
 }
 
 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
                      int size, u32 val)
 {
         struct zpci_dev *zdev = get_zdev_by_bus(bus);
+        int ret;
 
         if (!zdev || devfn != ZPCI_DEVFN)
-                return 0;
-        return zpci_cfg_store(zdev, where, val, size);
+                ret = -ENODEV;
+        else
+                ret = zpci_cfg_store(zdev, where, val, size);
+
+        return ret;
 }
 
 static struct pci_ops pci_root_ops = {