KVM: change kvm_assign_device() to print return value when iommu_attach_device() fails

Change existing kernel error message to include return value from
iommu_attach_device() when it fails. This will help debug device
assignment failures more effectively.

Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 1 insertions, 5 deletions

diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 037cb6730e68..18e1e30019e3 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -168,11 +168,7 @@ int kvm_assign_device(struct kvm *kvm,
 
         r = iommu_attach_device(domain, &pdev->dev);
         if (r) {
-                printk(KERN_ERR "assign device %x:%x:%x.%x failed",
-                        pci_domain_nr(pdev->bus),
-                        pdev->bus->number,
-                        PCI_SLOT(pdev->devfn),
-                        PCI_FUNC(pdev->devfn));
+                dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
                 return r;
         }