[PATCH v1 01/25] PCI: Add devm_request_pci_bus_resources()

[Bjorn Helgaas]

Several host bridge drivers iterate through the list of bridge windows to
request resources.  Several others don't request the window resources at
all.

Add a devm_request_pci_bus_resources() interface to make it easier for
drivers to request all the window resources.

Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
---
 drivers/pci/bus.c   |   29 ++++++++++++++++++++++++++++-
 include/linux/pci.h |    5 ++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index dd7cdbe..78b90c7 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -91,6 +91,34 @@ void pci_bus_remove_resources(struct pci_bus *bus)
        }
 }
 
+int devm_request_pci_bus_resources(struct device *dev,
+                                  struct list_head *resources)
+{
+       struct resource_entry *win;
+       struct resource *parent, *res;
+       int err;
+
+       resource_list_for_each_entry(win, resources) {
+               res = win->res;
+               switch (resource_type(res)) {
+               case IORESOURCE_IO:
+                       parent = &ioport_resource;
+                       break;
+               case IORESOURCE_MEM:
+                       parent = &iomem_resource;
+                       break;
+               default:
+                       continue;
+               }
+
+               err = devm_request_resource(dev, parent, res);
+               if (err)
+                       return err;
+       }
+
+       return 0;
+}
+
 static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
 static struct pci_bus_region pci_64_bit = {0,
@@ -397,4 +425,3 @@ void pci_bus_put(struct pci_bus *bus)
                put_device(&bus->dev);
 }
 EXPORT_SYMBOL(pci_bus_put);
-
diff --git a/include/linux/pci.h b/include/linux/pci.h
index b67e4df..6ac8360 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1143,9 +1143,12 @@ void pci_add_resource(struct list_head *resources, 
struct resource *res);
 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
                             resource_size_t offset);
 void pci_free_resource_list(struct list_head *resources);
-void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned 
int flags);
+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
+                         unsigned int flags);
 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
 void pci_bus_remove_resources(struct pci_bus *bus);
+int devm_request_pci_bus_resources(struct device *dev,
+                                  struct list_head *resources);
 
 #define pci_bus_for_each_resource(bus, res, i)                         \
        for (i = 0;                                                     \