[PATCH v2 1/2] PCI: Introduce pci_alloc_dev(struct pci_bus*) to replace alloc_pci_dev()

[Gu Zheng <guz.fnst@cn.fujitsu.com>]

>From d66f5b255abeedfbeff212b1e4bc3d8f4ae908e3 Mon Sep 17 00:00:00 2001
From: Gu Zheng <guz.fnst@cn.fujitsu.com>
Date: Mon, 22 Apr 2013 19:04:07 +0900
Subject: [PATCH v2 1/2] PCI: Introduce pci_alloc_dev(struct pci_bus*) to replace alloc_pci_dev()

Now here we introduce a new struct pci_dev *pci_alloc_dev(struct pci_bus *bus) to replace alloc_pci_dev().
It take a "struct pci_bus *" argument, so we can alloc a pci device on a target pci bus, and it acquire
the reference of the pci_bus.
Since the old alloc_pci_dev() is exported, so we still keep it for a while but mark it as __deprecated.

v2:
  Updated per code reviews from Bjorn Helgaas and Mike Qiu.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
---
 drivers/pci/probe.c |   13 ++++++++++++-
 include/linux/pci.h |    4 +++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b494066..0bb92e4 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1199,7 +1199,7 @@ static void pci_release_bus_bridge_dev(struct device *dev)
 	kfree(bridge);
 }
 
-struct pci_dev *alloc_pci_dev(void)
+struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 
@@ -1209,8 +1209,19 @@ struct pci_dev *alloc_pci_dev(void)
 
 	INIT_LIST_HEAD(&dev->bus_list);
 
+	if (bus) {
+		get_device(&bus->dev);
+		dev->bus = bus;
+	}
+
 	return dev;
 }
+EXPORT_SYMBOL(pci_alloc_dev);
+
+struct pci_dev *alloc_pci_dev(void)
+{
+	return pci_alloc_dev(NULL);
+}
 EXPORT_SYMBOL(alloc_pci_dev);
 
 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 710067f..682de2b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -348,7 +348,9 @@ static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
 	return dev;
 }
 
-extern struct pci_dev *alloc_pci_dev(void);
+extern struct pci_dev *pci_alloc_dev(struct pci_bus *bus);
+
+extern __deprecated struct pci_dev *alloc_pci_dev(void);
 
 #define	to_pci_dev(n) container_of(n, struct pci_dev, dev)
 #define for_each_pci_dev(d) while ((d = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)
-- 
1.7.7