[Xen-devel] [PATCH] xen/pciback: Don't print scary messages when unsupported by hypervisor.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

We print at the warninig level messages such as:
pciback 0000:90:00.5: MSI-X preparation failed (-38)

which is due to the hypervisor not supporting this sub-hypercall
(which was added in Xen 4.3).

Instead of having scary messages all the time - only have it
when the hypercall is actually supported.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/xen/xen-pciback/pci_stub.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c 
b/drivers/xen/xen-pciback/pci_stub.c
index 7acc796..ddc5500 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -115,7 +115,7 @@ static void pcistub_device_release(struct kref *kref)
                int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
                                                &ppdev);
 
-               if (err)
+               if (err && err != -ENOSYS)
                        dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
                                 err);
        }
@@ -376,7 +376,7 @@ static int __devinit pcistub_init_device(struct pci_dev 
*dev)
                };
 
                err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
-               if (err)
+               if (err && err != -ENOSYS)
                        dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
                                err);
        }
-- 
2.1.0


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