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>
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@ -1200,7 +1200,7 @@ static void pci_release_bus_bridge_dev(struct device *dev)
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kfree(bridge);
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}
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struct pci_dev *alloc_pci_dev(void)
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struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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@ -1210,9 +1210,16 @@ struct pci_dev *alloc_pci_dev(void)
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INIT_LIST_HEAD(&dev->bus_list);
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dev->dev.type = &pci_dev_type;
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dev->bus = pci_bus_get(bus);
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return dev;
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}
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EXPORT_SYMBOL(pci_alloc_dev);
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struct pci_dev *alloc_pci_dev(void)
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{
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return pci_alloc_dev(NULL);
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}
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EXPORT_SYMBOL(alloc_pci_dev);
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bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
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@ -364,7 +364,8 @@ static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
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return dev;
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}
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struct pci_dev *alloc_pci_dev(void);
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struct pci_dev *pci_alloc_dev(struct pci_bus *bus);
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struct pci_dev * __deprecated alloc_pci_dev(void);
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#define to_pci_dev(n) container_of(n, struct pci_dev, dev)
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#define for_each_pci_dev(d) while ((d = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)
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