On Tue, 19 Jun 2007 14:37:03 -0700 "Keshavamurthy, Anil S" <[email protected]> wrote:
> +struct pci_dev *
> +pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
You didn't need a newline there, but that's what the rest of that file
does. Hu hum.
> +{
> + struct pci_dev *tmp = NULL;
> +
> + if (pdev->is_pcie)
> + return NULL;
> + while (1) {
> + if (!pdev->bus->self)
> + break;
> + pdev = pdev->bus->self;
> + /* a p2p bridge */
> + if (!pdev->is_pcie) {
> + tmp = pdev;
> + continue;
> + }
> + /* PCI device should connect to a PCIE bridge */
> + BUG_ON(pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE);
I assume that if this bug triggers, we've found some broken hardware?
Going BUG seems like a pretty rude reaction to this, especially when it
would be so easy to drop a warning and then recover.
How's about this?
--- a/drivers/pci/search.c~intel-iommu-pci-generic-helper-function-fix
+++ a/drivers/pci/search.c
@@ -38,7 +38,11 @@ pci_find_upstream_pcie_bridge(struct pci
continue;
}
/* PCI device should connect to a PCIE bridge */
- BUG_ON(pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE);
+ if (pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE) {
+ /* Busted hardware? */
+ WARN_ON_ONCE(1);
+ return NULL;
+ }
return pdev;
}
-
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