Use resource pointer to get index in pci resources array/list.
-v2: export symbol for acpiphp compiling error, found by
Steven Newbury <st...@snewbury.org.uk>
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
drivers/pci/probe.c | 9 +++++++++
include/linux/pci.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 9cb3eb3..1df75f7 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -114,6 +114,15 @@ struct resource *pci_dev_resource_n(struct pci_dev *dev,
int n)
}
EXPORT_SYMBOL(pci_dev_resource_n);
+int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res)
+{
+ if (res >= dev->resource &&
+ res <= dev->resource + (PCI_NUM_RESOURCES - 1))
+ return res - dev->resource;
+
+ return -1;
+}
+
static u64 pci_size(u64 base, u64 maxbase, u64 mask)
{
u64 size = mask & maxbase; /* Find the significant bits */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6d450d2..f4da78d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -354,6 +354,7 @@ struct pci_dev {
};
struct resource *pci_dev_resource_n(struct pci_dev *dev, int n);
+int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res);
static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
{
--
1.8.1.4
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