pnp: add PNP resource range checking function

Add a PNP resource range check function, indicating whether a resource
has been assigned to any device.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
[apw@canonical.com: fixed up exports et al]
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index f604061d2bb0..ba9765427886 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -638,6 +638,24 @@ int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 }
 EXPORT_SYMBOL(pnp_possible_config);
 
+int pnp_range_reserved(resource_size_t start, resource_size_t end)
+{
+        struct pnp_dev *dev;
+        struct pnp_resource *pnp_res;
+        resource_size_t *dev_start, *dev_end;
+
+        pnp_for_each_dev(dev) {
+                list_for_each_entry(pnp_res, &dev->resources, list) {
+                        dev_start = &pnp_res->res.start;
+                        dev_end   = &pnp_res->res.end;
+                        if (ranged_conflict(&start, &end, dev_start, dev_end))
+                                return 1;
+                }
+        }
+        return 0;
+}
+EXPORT_SYMBOL(pnp_range_reserved);
+
 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 static int __init pnp_setup_reserve_irq(char *str)
 {