diff options
Diffstat (limited to 'arch/ia64/pci/pci.c')
| -rw-r--r-- | arch/ia64/pci/pci.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index ab829a22f8a..30d148f3404 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -645,18 +645,31 @@ char *ia64_pci_get_legacy_mem(struct pci_bus *bus) int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma) { + unsigned long size = vma->vm_end - vma->vm_start; + pgprot_t prot; char *addr; + /* + * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt + * for more details. + */ + if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size)) + return -EINVAL; + prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size, + vma->vm_page_prot); + if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot))) + return -EINVAL; + addr = pci_get_legacy_mem(bus); if (IS_ERR(addr)) return PTR_ERR(addr); vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT; - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + vma->vm_page_prot = prot; vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO); if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, - vma->vm_end - vma->vm_start, vma->vm_page_prot)) + size, vma->vm_page_prot)) return -EAGAIN; return 0; |