drm: nest modeset locks within fpriv->fbs_lock

Atm we still need to unconditionally take the modeset locks in the
rmfb paths. But eventually we only want to take them if there are
other users around as a slow-path. This way sane userspace avoids
blocking on edid reads and other stuff in rmfb if it ensures that the
fb isn't used anywhere by a crtc/plane.

We can do a quick check for such other users once framebuffers are
properly refcounting by locking at the refcount - if it's more than 1,
there are other users left. Again, rmfb racing against other ioctls
isn't a real problem, userspace is allowed to shoot its foot.

This patch just prepares this by moving the modeset locks to nest
within fpriv->fbs_lock. Now the distinction between the fbs_lock and
the device-global fb_lock is clear, since we need to hold the fbs_lock
outside of any modeset_locks in fb_release.

Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index a50f755..09e02a7 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2282,13 +2282,13 @@ int drm_mode_addfb(struct drm_device *dev,
                drm_modeset_unlock_all(dev);
                return PTR_ERR(fb);
        }
+       drm_modeset_unlock_all(dev);
 
        mutex_lock(&file_priv->fbs_lock);
        or->fb_id = fb->base.id;
        list_add(&fb->filp_head, &file_priv->fbs);
        DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
        mutex_unlock(&file_priv->fbs_lock);
-       drm_modeset_unlock_all(dev);
 
        return ret;
 }
@@ -2465,6 +2465,7 @@ int drm_mode_addfb2(struct drm_device *dev,
                drm_modeset_unlock_all(dev);
                return PTR_ERR(fb);
        }
+       drm_modeset_unlock_all(dev);
 
        mutex_lock(&file_priv->fbs_lock);
        r->fb_id = fb->base.id;
@@ -2472,7 +2473,6 @@ int drm_mode_addfb2(struct drm_device *dev,
        DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
        mutex_unlock(&file_priv->fbs_lock);
 
-       drm_modeset_unlock_all(dev);
 
        return ret;
 }
@@ -2670,7 +2670,6 @@ void drm_fb_release(struct drm_file *priv)
        struct drm_device *dev = priv->minor->dev;
        struct drm_framebuffer *fb, *tfb;
 
-       drm_modeset_lock_all(dev);
        mutex_lock(&priv->fbs_lock);
        list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
 
@@ -2682,10 +2681,11 @@ void drm_fb_release(struct drm_file *priv)
                list_del_init(&fb->filp_head);
 
                /* This will also drop the fpriv->fbs reference. */
+               drm_modeset_lock_all(dev);
                drm_framebuffer_remove(fb);
+               drm_modeset_unlock_all(dev);
        }
        mutex_unlock(&priv->fbs_lock);
-       drm_modeset_unlock_all(dev);
 }
 
 /**