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[Xen-devel] [PATCH 8/8] [xen/pcifront] Check pci_claim_resource return v

Currently if we allocate more than 4GB to the unprivileged domain
we cannot use PCI passthrough. Make the user aware that the device
is no good.

Will remove this once the 4GB issue is fixed.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
 drivers/pci/xen-pcifront.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 10b2227..9ad0ea5 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -402,7 +402,12 @@ static int pcifront_claim_resource(struct pci_dev *dev, 
void *data)
                if (!r->parent && r->start && r->flags) {
                        dev_dbg(&pdev->xdev->dev, "claiming resource %s/%d\n",
                                pci_name(dev), i);
-                       pci_claim_resource(dev, i);
+                       if (pci_claim_resource(dev, i)) {
+                               dev_err(&pdev->xdev->dev, "Could not claim "
+                                       "resource %s/%d! Device offline. Try "
+                                       "giving less than 4GB to domain.\n",
+                                       pci_name(dev), i);
+                       }

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