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PCI: Introduce pci_alloc_dev(struct pci_bus*) to replace alloc_pci_dev()

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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>
This commit is contained in:
Gu Zheng 2013-05-25 21:48:30 +08:00 • committed by Bjorn Helgaas
commit 3c6e6ae770
2 changed files with 10 additions and 2 deletions
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3
include/linux/pci.h
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@ -364,7 +364,8 @@ static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
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)