[PATCH v2 1/8] pc-bios/s390-ccw: Check if a PCI function is already enabled before trying to enable it

[jrossi@linux.ibm.com]

From: Jared Rossi <jrossi@linux.ibm.com>

Enabling a PCI function that is already configured will result in an error.
Simply check if the device has already been enabled, and if so, return
without doing anything further; otherwise, enable it as usual.

Also, because enable_pci_function() prints its own message, let's remove
the duplicate message emitted during the virtio PCI setup steps.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
---
 pc-bios/s390-ccw/clp.c        | 4 ++++
 pc-bios/s390-ccw/virtio-pci.c | 1 -
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/clp.c b/pc-bios/s390-ccw/clp.c
index ca9565d8de..7917f13345 100644
--- a/pc-bios/s390-ccw/clp.c
+++ b/pc-bios/s390-ccw/clp.c
@@ -82,6 +82,10 @@ int enable_pci_function(uint32_t *fhandle)
 {
     ClpReqRspSetPci rrb;
 
+    if (*fhandle & CLP_FHLIST_MASK_CONFIG) {
+        return 0;   /* already enabled */
+    }
+
     rrb.request.hdr.len = sizeof(ClpReqSetPci);
     rrb.request.hdr.cmd = 0x05;
     rrb.request.fh = *fhandle;
diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
index f501252c81..231ab6e04d 100644
--- a/pc-bios/s390-ccw/virtio-pci.c
+++ b/pc-bios/s390-ccw/virtio-pci.c
@@ -452,7 +452,6 @@ int virtio_pci_setup_device(void)
     VDev *vdev = virtio_get_device();
 
     if (enable_pci_function(&vdev->pci_fh)) {
-        puts("Failed to enable PCI function");
         return -ENODEV;
     }
 
-- 
2.54.0