drm/gma500: Drop dev->struct_mutex from modeset code

It's either init code or already protected by other means. Note
that psb_gtt_pin/unpin has it's own lock, and that's really the
only piece of driver private state - all the modeset state is
protected with modeset locks already.

The only important bit is to switch all gem_obj_unref calls to the
_unlocked variant.

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1448271183-20523-18-git-send-email-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c
index 001b450..ff17af4 100644 (file)
--- a/drivers/gpu/drm/gma500/gma_display.c
+++ b/drivers/gpu/drm/gma500/gma_display.c
@@ -349,8 +349,6 @@ int gma_crtc_cursor_set(struct drm_crtc *crtc,
        /* If we didn't get a handle then turn the cursor off */
        if (!handle) {
                temp = CURSOR_MODE_DISABLE;
-               mutex_lock(&dev->struct_mutex);
-
                if (gma_power_begin(dev, false)) {
                        REG_WRITE(control, temp);
                        REG_WRITE(base, 0);
@@ -362,11 +360,9 @@ int gma_crtc_cursor_set(struct drm_crtc *crtc,
                        gt = container_of(gma_crtc->cursor_obj,
                                          struct gtt_range, gem);
                        psb_gtt_unpin(gt);
-                       drm_gem_object_unreference(gma_crtc->cursor_obj);
+                       drm_gem_object_unreference_unlocked(gma_crtc->cursor_obj);
                        gma_crtc->cursor_obj = NULL;
                }
-
-               mutex_unlock(&dev->struct_mutex);
                return 0;
        }
 
@@ -376,7 +372,6 @@ int gma_crtc_cursor_set(struct drm_crtc *crtc,
                return -EINVAL;
        }
 
-       mutex_lock(&dev->struct_mutex);
        obj = drm_gem_object_lookup(dev, file_priv, handle);
        if (!obj) {
                ret = -ENOENT;
@@ -441,17 +436,15 @@ int gma_crtc_cursor_set(struct drm_crtc *crtc,
        if (gma_crtc->cursor_obj) {
                gt = container_of(gma_crtc->cursor_obj, struct gtt_range, gem);
                psb_gtt_unpin(gt);
-               drm_gem_object_unreference(gma_crtc->cursor_obj);
+               drm_gem_object_unreference_unlocked(gma_crtc->cursor_obj);
        }
 
        gma_crtc->cursor_obj = obj;
 unlock:
-       mutex_unlock(&dev->struct_mutex);
        return ret;
 
 unref_cursor:
-       drm_gem_object_unreference(obj);
-       mutex_unlock(&dev->struct_mutex);
+       drm_gem_object_unreference_unlocked(obj);
        return ret;
 }