diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2017-04-07 13:01:00 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-20 16:47:47 +0300 |
| commit | fcdb10d6b179fde41ca94d032afda8f4ed796b8e (patch) | |
| tree | c298e32733f546d057fb4af9c2c36736ea86b8fc | |
| parent | 61eee41ae135517392d05cbf1177523a02f12727 (diff) | |
| download | linux-fcdb10d6b179fde41ca94d032afda8f4ed796b8e.tar.xz | |
ia64: Remove redundant checks for WC in pci_mmap_page_range()
For a PCI MMIO BAR, phys_mem_access_prot() should always return UC or WC.
And while a mixture of cached and uncached mappings is forbidden, we were
already mixing WC and UC, which is OK. Just do as we're asked.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Tested-by: Tony Luck <tony.luck@intel.com>
| -rw-r--r-- | arch/ia64/pci/pci.c | 18 |
1 files changed, 2 insertions, 16 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index 27020f30caa6..7438e8c84cdd 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -423,9 +423,6 @@ pci_mmap_page_range (struct pci_dev *dev, int bar, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { - unsigned long size = vma->vm_end - vma->vm_start; - pgprot_t prot; - /* * I/O space cannot be accessed via normal processor loads and * stores on this platform. @@ -439,21 +436,10 @@ pci_mmap_page_range (struct pci_dev *dev, int bar, */ return -EINVAL; - prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size, - vma->vm_page_prot); - - /* - * If the user requested WC, the kernel uses UC or WC for this region, - * and the chipset supports WC, we can use WC. Otherwise, we have to - * use the same attribute the kernel uses. - */ - if (write_combine && - ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC || - (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) && - efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) + if (write_combine) vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); else - vma->vm_page_prot = prot; + vma->vm_page_prot = pgprot_device(vma->vm_page_prot); if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start, vma->vm_page_prot)) |