PCI: Introduce pci_alloc_dev(struct pci_bus*) to replace alloc_pci_dev()
Here we introduce a new interface to replace alloc_pci_dev():
struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
It takes a "struct pci_bus *" argument, so we can alloc a PCI device
on a target PCI bus, and it acquires a reference on the pci_bus.
We use pci_alloc_dev(NULL) to simplify the old alloc_pci_dev(),
and keep it for a while but mark it as __deprecated.
Holding a reference to the pci_bus ensures that referencing
pci_dev->bus is valid as long as the pci_dev is valid.
[bhelgaas: keep existing "return error early" structure in pci_alloc_dev()]
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>diff --git a/include/linux/pci.h b/include/linux/pci.h
index 7556c59..b0f4a82 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -364,7 +364,8 @@
return dev;
}
-struct pci_dev *alloc_pci_dev(void);
+struct pci_dev *pci_alloc_dev(struct pci_bus *bus);
+struct pci_dev * __deprecated 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)