diff options
| author | Krzysztof Wilczyński <kwilczynski@kernel.org> | 2026-05-08 04:35:39 +0000 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-06-23 15:19:09 -0500 |
| commit | 385ec1d40756e3bcb868814e305089b4edd32149 (patch) | |
| tree | fb36c9d6842bbdd6becca6039810d242fa200339 /arch | |
| parent | e52e497e3778c99c3fb26ef6a47af6a219133f8c (diff) | |
| download | ath-385ec1d40756e3bcb868814e305089b4edd32149.tar.gz | |
alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range()
Currently, pci_mmap_legacy_page_range() reads the legacy resource size from
bus->legacy_mem->size or bus->legacy_io->size. This couples the mmap
bounds check to the struct pci_bus fields that will be removed when legacy
attributes are converted to static definitions.
Compute the size directly using PCI_LEGACY_MEM_SIZE (0x100000) and
PCI_LEGACY_IO_SIZE (0xffff) macros, and shift by 5 bits for sparse systems.
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-21-kwilczynski@kernel.org
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/alpha/kernel/pci-sysfs.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c index 435654ffa4a07..2038acbcfd2a9 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -173,8 +173,11 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma, int sparse = has_sparse(hose, mmap_type); unsigned long res_size; - res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size : - bus->legacy_io->size; + res_size = (mmap_type == pci_mmap_mem) ? PCI_LEGACY_MEM_SIZE : + PCI_LEGACY_IO_SIZE; + if (sparse) + res_size <<= 5; + if (!__legacy_mmap_fits(vma, res_size)) return -EINVAL; |