From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Populating fb->dev before drm_framebuffer_init() allows us to use
fb->dev already while validating the framebuffer. Let's have
drm_helper_mode_fill_fb_struct() do that for us.
Also make drm_framebuffer_init() warn us if a different device
pointer is passed to it than was passed to
drm_helper_mode_fill_fb_struct().
v2: Reject fbs with invalid fb->dev (Laurent)
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx> (v1)
---
drivers/gpu/drm/drm_framebuffer.c | 5 ++++-
drivers/gpu/drm/drm_modeset_helper.c | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index cbf0c893f426..f397565d3c20 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -631,8 +631,11 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
{
int ret;
+ if (WARN_ON_ONCE(fb->dev != dev))
+ return -EINVAL;
+
INIT_LIST_HEAD(&fb->filp_head);
- fb->dev = dev;
+
fb->funcs = funcs;
ret = drm_mode_object_get_reg(dev, &fb->base, DRM_MODE_OBJECT_FB,
diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c
index 285ffcba0fe8..57a319e3f780 100644
--- a/drivers/gpu/drm/drm_modeset_helper.c
+++ b/drivers/gpu/drm/drm_modeset_helper.c
@@ -90,6 +90,7 @@ void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
fb->bits_per_pixel = info->cpp[0] * 8;
}
+ fb->dev = dev;
fb->width = mode_cmd->width;
fb->height = mode_cmd->height;
for (i = 0; i < 4; i++) {
--
2.7.4
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