Merge branch 'drm-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...

[pandora-kernel.git] / drivers / char / drm / drm_vm.c

diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
index ae26919..b9cfc07 100644 (file)
--- a/drivers/char/drm/drm_vm.c
+++ b/drivers/char/drm/drm_vm.c
@@ -473,6 +473,22 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
        }
        unlock_kernel();
 
+       if (!capable(CAP_SYS_ADMIN) &&
+           (dma->flags & _DRM_DMA_USE_PCI_RO)) {
+               vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
+#if defined(__i386__) || defined(__x86_64__)
+               pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
+#else
+               /* Ye gads this is ugly.  With more thought
+                  we could move this up higher and use
+                  `protection_map' instead.  */
+               vma->vm_page_prot =
+                   __pgprot(pte_val
+                            (pte_wrprotect
+                             (__pte(pgprot_val(vma->vm_page_prot)))));
+#endif
+       }
+
        vma->vm_ops = &drm_vm_dma_ops;
 
        vma->vm_flags |= VM_RESERVED;   /* Don't swap */