Merge tag 'usb-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

[cascardo/linux.git] / drivers / pci / pci.c

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aab9d51..415956c 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -479,6 +479,30 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
 }
 EXPORT_SYMBOL(pci_find_parent_resource);
 
+/**
+ * pci_find_resource - Return matching PCI device resource
+ * @dev: PCI device to query
+ * @res: Resource to look for
+ *
+ * Goes over standard PCI resources (BARs) and checks if the given resource
+ * is partially or fully contained in any of them. In that case the
+ * matching resource is returned, %NULL otherwise.
+ */
+struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res)
+{
+       int i;
+
+       for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+               struct resource *r = &dev->resource[i];
+
+               if (r->start && resource_contains(r, res))
+                       return r;
+       }
+
+       return NULL;
+}
+EXPORT_SYMBOL(pci_find_resource);
+
 /**
  * pci_find_pcie_root_port - return PCIe Root Port
  * @dev: PCI device to query