PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms

In the PCI_MMAP_PROCFS case when the address being passed by the user is a
'user visible' resource address based on the bus window, and not the actual
contents of the resource, that's what we need to be checking it against.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 25d010d..7ac258f 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -985,15 +985,19 @@ void pci_remove_legacy_files(struct pci_bus *b)
 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
                  enum pci_mmap_api mmap_api)
 {
-       unsigned long nr, start, size, pci_start;
+       unsigned long nr, start, size;
+       resource_size_t pci_start = 0, pci_end;
 
        if (pci_resource_len(pdev, resno) == 0)
                return 0;
        nr = vma_pages(vma);
        start = vma->vm_pgoff;
        size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
-       pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
-                       pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
+       if (mmap_api == PCI_MMAP_PROCFS) {
+               pci_resource_to_user(pdev, resno, &pdev->resource[resno],
+                                    &pci_start, &pci_end);
+               pci_start >>= PAGE_SHIFT;
+       }
        if (start >= pci_start && start < pci_start + size &&
                        start + nr <= pci_start + size)
                return 1;