gpu: drm: exynos: Change return type to vm_fault_t

Use new return type vm_fault_t for fault handler
in struct vm_operations_struct.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_gem.c

@@ -431,37 +431,24 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 	return 0;
 }
 
-int exynos_drm_gem_fault(struct vm_fault *vmf)
+vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct drm_gem_object *obj = vma->vm_private_data;
 	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 	unsigned long pfn;
 	pgoff_t page_offset;
-	int ret;
 
 	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
 	if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
 		DRM_ERROR("invalid page offset\n");
-		ret = -EINVAL;
-		goto out;
+		return VM_FAULT_SIGBUS;
 	}
 
 	pfn = page_to_pfn(exynos_gem->pages[page_offset]);
-	ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
-
-out:
-	switch (ret) {
-	case 0:
-	case -ERESTARTSYS:
-	case -EINTR:
-		return VM_FAULT_NOPAGE;
-	case -ENOMEM:
-		return VM_FAULT_OOM;
-	default:
-		return VM_FAULT_SIGBUS;
-	}
+	return vmf_insert_mixed(vma, vmf->address,
+			__pfn_to_pfn_t(pfn, PFN_DEV));
 }
 
 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,

drivers/gpu/drm/exynos/exynos_drm_gem.h

@@ -13,6 +13,7 @@
 #define _EXYNOS_DRM_GEM_H_
 
 #include <drm/drm_gem.h>
+#include <linux/mm_types.h>
 
 #define to_exynos_gem(x)	container_of(x, struct exynos_drm_gem, base)
 
@@ -111,7 +112,7 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 			       struct drm_mode_create_dumb *args);
 
 /* page fault handler and mmap fault address(virtual) to physical memory. */
-int exynos_drm_gem_fault(struct vm_fault *vmf);
+vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf);
 
 /* set vm_flags and we can change the vm attribute to other one at here. */
 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);