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PCI: Return u16 from pci_find_ext_capability() and similar

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PCI Express Extended Capabilities are in config space between offsets 256
and 4K.  These offsets all fit in 16 bits.

Change the return type of pci_find_ext_capability() and supporting
functions from int to u16 to match the specification.  Many callers use
"int", which is fine, but there's no need to store more than a u16.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas
2020-12-04 15:14:07 -06:00
parent f646c2a0a6
commit ee8b1c478a
2 changed files with 6 additions and 6 deletions
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6
include/linux/pci.h
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@@ -381,7 +381,7 @@ struct pci_dev {
struct pcie_link_state *link_state; /* ASPM link state */
unsigned int ltr_path:1; /* Latency Tolerance Reporting
supported from root to here */
int l1ss; /* L1SS Capability pointer */
u16 l1ss; /* L1SS Capability pointer */
#endif
unsigned int eetlp_prefix_path:1; /* End-to-End TLP Prefix */
@@ -1069,8 +1069,8 @@ u8 pci_find_capability(struct pci_dev *dev, int cap);
u8 pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
u8 pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
u8 pci_find_next_ht_capability(struct pci_dev *dev, u8 pos, int ht_cap);
int pci_find_ext_capability(struct pci_dev *dev, int cap);
int pci_find_next_ext_capability(struct pci_dev *dev, int pos, int cap);
u16 pci_find_ext_capability(struct pci_dev *dev, int cap);
u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 pos, int cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
u64 pci_get_dsn(struct pci_dev *dev);