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Merge branch 'pci/resource'

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- Decline requests to resize BARs if platform requires us to preserve
  resource assignments (Ard Biesheuvel)

* pci/resource:
  PCI: Decline to resize resources if boot config must be preserved
This commit is contained in:
Bjorn Helgaas
2021-02-24 14:59:19 -06:00
parent 215fc27dd8 729e3a669d
commit da8eb3feea
1 changed files with 6 additions and 0 deletions
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6
drivers/pci/setup-res.c
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@@ -410,10 +410,16 @@ EXPORT_SYMBOL(pci_release_resource);
int pci_resize_resource(struct pci_dev *dev, int resno, int size) int pci_resize_resource(struct pci_dev *dev, int resno, int size)
{ {
struct resource *res = dev->resource + resno; struct resource *res = dev->resource + resno;
struct pci_host_bridge *host;
int old, ret; int old, ret;
u32 sizes; u32 sizes;
u16 cmd; u16 cmd;
/* Check if we must preserve the firmware's resource assignment */
host = pci_find_host_bridge(dev->bus);
if (host->preserve_config)
return -ENOTSUPP;
/* Make sure the resource isn't assigned before resizing it. */ /* Make sure the resource isn't assigned before resizing it. */
if (!(res->flags & IORESOURCE_UNSET)) if (!(res->flags & IORESOURCE_UNSET))
return -EBUSY; return -EBUSY;