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PCI: Add devm_pci_alloc_host_bridge() interface

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Struct pci_host_bridge can be allocated by PCI host bridge drivers which
usually allocate and map memory through devm managed interfaces.

Add a devm version for the pci_alloc_host_bridge() interface to simplify
PCI host controller driver porting and simplify the driver failure paths.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Lorenzo Pieralisi 2017-06-28 15:13:53 -05:00 committed by Bjorn Helgaas
parent dff79b91b8
commit 5c3f18cce0
3 changed files with 25 additions and 2 deletions
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1
Documentation/driver-model/devres.txt
View file

@ -342,6 +342,7 @@ PER-CPU MEM
devm_free_percpu()
PCI
devm_pci_alloc_host_bridge() : managed PCI host bridge allocation
devm_pci_remap_cfgspace() : ioremap PCI configuration space
devm_pci_remap_cfg_resource() : ioremap PCI configuration space resource
pcim_enable_device() : after success, all PCI ops become managed

24
drivers/pci/probe.c
View file

@ -510,14 +510,18 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
return b;
}
static void pci_release_host_bridge_dev(struct device *dev)
static void devm_pci_release_host_bridge_dev(struct device *dev)
{
struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
if (bridge->release_fn)
bridge->release_fn(bridge);
}
pci_free_host_bridge(bridge);
static void pci_release_host_bridge_dev(struct device *dev)
{
devm_pci_release_host_bridge_dev(dev);
pci_free_host_bridge(to_pci_host_bridge(dev));
}
struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
@ -535,6 +539,22 @@ struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
}
EXPORT_SYMBOL(pci_alloc_host_bridge);
struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
size_t priv)
{
struct pci_host_bridge *bridge;
bridge = devm_kzalloc(dev, sizeof(*bridge) + priv, GFP_KERNEL);
if (!bridge)
return NULL;
INIT_LIST_HEAD(&bridge->windows);
bridge->dev.release = devm_pci_release_host_bridge_dev;
return bridge;
}
EXPORT_SYMBOL(devm_pci_alloc_host_bridge);
void pci_free_host_bridge(struct pci_host_bridge *bridge)
{
pci_free_resource_list(&bridge->windows);

2
include/linux/pci.h
View file

@ -458,6 +458,8 @@ static inline struct pci_host_bridge *pci_host_bridge_from_priv(void *priv)
}
struct pci_host_bridge *pci_alloc_host_bridge(size_t priv);
struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
size_t priv);
void pci_free_host_bridge(struct pci_host_bridge *bridge);
int pci_register_host_bridge(struct pci_host_bridge *bridge);
struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus);