drm: Make the per-driver file_operations struct const

From fdf1fdebaa00f81de18c227f32f8074c8b352d50 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Sun, 30 Oct 2011 19:06:07 -0700
Subject: [PATCH] drm: Make the per-driver file_operations struct const

The DRM layer keeps a copy of struct file_operations inside its
big driver struct... which prevents it from being consistent and static.
For consistency (and the general security objective of having such things
static), it's desirable to get this fixed.

This patch splits out the file_operations field to its own struct,
which is then "static const", and just stick a pointer to this into
the driver struct, making it more consistent with how the rest of the
kernel does this.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 16 insertions, 15 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index cc531bb59c26..9f592703c369 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -788,6 +788,21 @@ static struct vm_operations_struct i915_gem_vm_ops = {
         .close = drm_gem_vm_close,
 };
 
+static const struct file_operations i915_driver_fops = {
+        .owner = THIS_MODULE,
+        .open = drm_open,
+        .release = drm_release,
+        .unlocked_ioctl = drm_ioctl,
+        .mmap = drm_gem_mmap,
+        .poll = drm_poll,
+        .fasync = drm_fasync,
+        .read = drm_read,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = i915_compat_ioctl,
+#endif
+        .llseek = noop_llseek,
+};
+
 static struct drm_driver driver = {
         /* don't use mtrr's here, the Xserver or user space app should
          * deal with them for intel hardware.
@@ -821,21 +836,7 @@ static struct drm_driver driver = {
         .dumb_map_offset = i915_gem_mmap_gtt,
         .dumb_destroy = i915_gem_dumb_destroy,
         .ioctls = i915_ioctls,
-        .fops = {
-                 .owner = THIS_MODULE,
-                 .open = drm_open,
-                 .release = drm_release,
-                 .unlocked_ioctl = drm_ioctl,
-                 .mmap = drm_gem_mmap,
-                 .poll = drm_poll,
-                 .fasync = drm_fasync,
-                 .read = drm_read,
-#ifdef CONFIG_COMPAT
-                 .compat_ioctl = i915_compat_ioctl,
-#endif
-                 .llseek = noop_llseek,
-        },
-
+        .fops = &i915_driver_fops,
         .name = DRIVER_NAME,
         .desc = DRIVER_DESC,
         .date = DRIVER_DATE,