drm/i915: alloc intel_fb in the intel_fbdev struct

Allocate this struct instead, so we can re-use another allocated
elsewhere if needed.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: WARN_ON if there's no backing storage attached to an fb,
that's a bug.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -7769,11 +7769,11 @@ mode_fits_in_fbdev(struct drm_device *dev,
 	if (dev_priv->fbdev == NULL)
 		return NULL;
 
-	obj = dev_priv->fbdev->ifb.obj;
+	obj = dev_priv->fbdev->fb->obj;
 	if (obj == NULL)
 		return NULL;
 
-	fb = &dev_priv->fbdev->ifb.base;
+	fb = &dev_priv->fbdev->fb->base;
 	if (fb->pitches[0] < intel_framebuffer_pitch_for_width(mode->hdisplay,
 							       fb->bits_per_pixel))
 		return NULL;

drivers/gpu/drm/i915/intel_drv.h

@@ -110,7 +110,7 @@ struct intel_framebuffer {
 
 struct intel_fbdev {
 	struct drm_fb_helper helper;
-	struct intel_framebuffer ifb;
+	struct intel_framebuffer *fb;
 	struct list_head fbdev_list;
 	struct drm_display_mode *our_mode;
 };

drivers/gpu/drm/i915/intel_fbdev.c

@@ -62,11 +62,20 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 {
 	struct intel_fbdev *ifbdev =
 		container_of(helper, struct intel_fbdev, helper);
+	struct intel_framebuffer *fb;
 	struct drm_device *dev = helper->dev;
 	struct drm_mode_fb_cmd2 mode_cmd = {};
 	struct drm_i915_gem_object *obj;
 	int size, ret;
 
+	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
+	if (!fb) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ifbdev->fb = fb;
+
 	/* we don't do packed 24bpp */
 	if (sizes->surface_bpp == 24)
 		sizes->surface_bpp = 32;
@@ -97,7 +106,7 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 		goto out_unref;
 	}
 
-	ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, obj);
+	ret = intel_framebuffer_init(dev, ifbdev->fb, &mode_cmd, obj);
 	if (ret)
 		goto out_unpin;
 
@@ -116,7 +125,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 {
 	struct intel_fbdev *ifbdev =
 		container_of(helper, struct intel_fbdev, helper);
-	struct intel_framebuffer *intel_fb = &ifbdev->ifb;
+	struct intel_framebuffer *intel_fb = ifbdev->fb;
 	struct drm_device *dev = helper->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct fb_info *info;
@@ -126,11 +135,12 @@ static int intelfb_create(struct drm_fb_helper *helper,
 
 	mutex_lock(&dev->struct_mutex);
 
-	if (!intel_fb->obj) {
+	if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 		DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 		ret = intelfb_alloc(helper, sizes);
 		if (ret)
 			goto out_unlock;
+		intel_fb = ifbdev->fb;
 	} else {
 		DRM_DEBUG_KMS("re-using BIOS fb\n");
 		sizes->fb_width = intel_fb->base.width;
@@ -148,7 +158,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 
 	info->par = helper;
 
-	fb = &ifbdev->ifb.base;
+	fb = &ifbdev->fb->base;
 
 	ifbdev->helper.fb = fb;
 	ifbdev->helper.fbdev = info;
@@ -194,7 +204,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	 * If the object is stolen however, it will be full of whatever
 	 * garbage was left in there.
 	 */
-	if (ifbdev->ifb.obj->stolen)
+	if (ifbdev->fb->obj->stolen)
 		memset_io(info->screen_base, 0, info->screen_size);
 
 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
@@ -258,8 +268,9 @@ static void intel_fbdev_destroy(struct drm_device *dev,
 
 	drm_fb_helper_fini(&ifbdev->helper);
 
-	drm_framebuffer_unregister_private(&ifbdev->ifb.base);
+	drm_framebuffer_unregister_private(&ifbdev->fb->base);
-	intel_framebuffer_fini(&ifbdev->ifb);
+	intel_framebuffer_fini(ifbdev->fb);
+	kfree(ifbdev->fb);
 }
 
 int intel_fbdev_init(struct drm_device *dev)
@@ -322,7 +333,7 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 	 * been restored from swap. If the object is stolen however, it will be
 	 * full of whatever garbage was left in there.
 	 */
-	if (state == FBINFO_STATE_RUNNING && ifbdev->ifb.obj->stolen)
+	if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 		memset_io(info->screen_base, 0, info->screen_size);
 
 	fb_set_suspend(info, state);