ieee1394: nopage

Convert ieee1394 from nopage to fault.
Remove redundant vma range checks (correct resource range check is retained).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 18 insertions, 23 deletions

diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
index 7c4eb39b7024..ec024b5d5e5e 100644
--- a/drivers/ieee1394/dma.c
+++ b/drivers/ieee1394/dma.c
@@ -231,37 +231,32 @@ void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
 
 #ifdef CONFIG_MMU
 
-/* nopage() handler for mmap access */
+/* fault() handler for mmap access */
 
-static struct page *dma_region_pagefault(struct vm_area_struct *area,
-                                         unsigned long address, int *type)
+static int dma_region_pagefault(struct vm_area_struct *vma,
+                                        struct vm_fault *vmf)
 {
-        unsigned long offset;
         unsigned long kernel_virt_addr;
-        struct page *ret = NOPAGE_SIGBUS;
 
-        struct dma_region *dma = (struct dma_region *)area->vm_private_data;
+        struct dma_region *dma = (struct dma_region *)vma->vm_private_data;
 
         if (!dma->kvirt)
-                goto out;
-
-        if ((address < (unsigned long)area->vm_start) ||
-            (address >
-             (unsigned long)area->vm_start + (dma->n_pages << PAGE_SHIFT)))
-                goto out;
-
-        if (type)
-                *type = VM_FAULT_MINOR;
-        offset = address - area->vm_start;
-        kernel_virt_addr = (unsigned long)dma->kvirt + offset;
-        ret = vmalloc_to_page((void *)kernel_virt_addr);
-        get_page(ret);
-      out:
-        return ret;
+                goto error;
+
+        if (vmf->pgoff >= dma->n_pages)
+                goto error;
+
+        kernel_virt_addr = (unsigned long)dma->kvirt + (vmf->pgoff << PAGE_SHIFT);
+        vmf->page = vmalloc_to_page((void *)kernel_virt_addr);
+        get_page(vmf->page);
+        return 0;
+
+      error:
+        return VM_FAULT_SIGBUS;
 }
 
 static struct vm_operations_struct dma_region_vm_ops = {
-        .nopage = dma_region_pagefault,
+        .fault = dma_region_pagefault,
 };
 
 /**
@@ -275,7 +270,7 @@ int dma_region_mmap(struct dma_region *dma, struct file *file,
         if (!dma->kvirt)
                 return -EINVAL;
 
-        /* must be page-aligned */
+        /* must be page-aligned (XXX: comment is wrong, we could allow pgoff) */
         if (vma->vm_pgoff != 0)
                 return -EINVAL;