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PCI: Return NULL for to_pci_driver(NULL)

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to_pci_driver() takes a pointer to a struct device_driver and uses
container_of() to find the struct pci_driver that contains it.

If given a NULL pointer to a struct device_driver, return a NULL pci_driver
pointer instead of applying container_of() to NULL.

This simplifies callers that would otherwise have to check for a NULL
pointer first.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas
2021-10-12 15:42:59 -05:00
parent e4e737bb5c
commit 8e9028b379
1 changed files with 4 additions and 1 deletions
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5
include/linux/pci.h
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@@ -900,7 +900,10 @@ struct pci_driver {
struct pci_dynids dynids;
};
#define to_pci_driver(drv) container_of(drv, struct pci_driver, driver)
static inline struct pci_driver *to_pci_driver(struct device_driver *drv)
{
return drv ? container_of(drv, struct pci_driver, driver) : NULL;
}
/**
* PCI_DEVICE - macro used to describe a specific PCI device