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alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range()

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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
This commit is contained in:
Krzysztof Wilczyński 2026-05-08 04:35:39 +00:00 committed by Bjorn Helgaas
parent e52e497e37
commit 385ec1d407
1 changed files with 5 additions and 2 deletions
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7
arch/alpha/kernel/pci-sysfs.c
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@ -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;