Since my last struct_mutex crusade someone escaped!
This already has the advantage that for the common case when someone else holds a ref the unref won't even acquire dev->struct_mutex. And I'm working on code to allow drivers to completely opt-out of any and all dev->struct_mutex usage, but that only works if they use the _unlocked variants everywhere.
v2: Drop comment too.
v3: Drop the other comment too.
Cc: Eric Anholt eric@anholt.net Signed-off-by: Daniel Vetter daniel.vetter@intel.com --- drivers/gpu/drm/vc4/vc4_bo.c | 2 -- drivers/gpu/drm/vc4/vc4_gem.c | 11 +++-------- 2 files changed, 3 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c index e5a9d3aaf45f..59adcf8532dd 100644 --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -291,8 +291,6 @@ static void vc4_bo_cache_free_old(struct drm_device *dev)
/* Called on the last userspace/kernel unreference of the BO. Returns * it to the BO cache if possible, otherwise frees it. - * - * Note that this is called with the struct_mutex held. */ void vc4_free_object(struct drm_gem_object *gem_bo) { diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index 46899d6de675..6155e8aca1c6 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -53,10 +53,8 @@ vc4_free_hang_state(struct drm_device *dev, struct vc4_hang_state *state) { unsigned int i;
- mutex_lock(&dev->struct_mutex); for (i = 0; i < state->user_state.bo_count; i++) - drm_gem_object_unreference(state->bo[i]); - mutex_unlock(&dev->struct_mutex); + drm_gem_object_unreference_unlocked(state->bo[i]);
kfree(state); } @@ -687,11 +685,9 @@ vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec) struct vc4_dev *vc4 = to_vc4_dev(dev); unsigned i;
- /* Need the struct lock for drm_gem_object_unreference(). */ - mutex_lock(&dev->struct_mutex); if (exec->bo) { for (i = 0; i < exec->bo_count; i++) - drm_gem_object_unreference(&exec->bo[i]->base); + drm_gem_object_unreference_unlocked(&exec->bo[i]->base); kfree(exec->bo); }
@@ -699,9 +695,8 @@ vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec) struct vc4_bo *bo = list_first_entry(&exec->unref_list, struct vc4_bo, unref_head); list_del(&bo->unref_head); - drm_gem_object_unreference(&bo->base.base); + drm_gem_object_unreference_unlocked(&bo->base.base); } - mutex_unlock(&dev->struct_mutex);
mutex_lock(&vc4->power_lock); if (--vc4->power_refcount == 0)