drm/vmwgfx: Replace ttm_bo_unref with ttm_bo_put

The function ttm_bo_put releases a reference to a TTM buffer object. The
function's name is more aligned to the Linux kernel convention of naming
ref-counting function _get and _put.

A call to ttm_bo_unref takes the address of the TTM BO object's pointer and
clears the pointer's value to NULL. This is not necessary in most cases and
sometimes even worked around by the calling code. A call to ttm_bo_put only
releases the reference without clearing the pointer.

In places where is might be necessary, the current behaviour of cleaning the
pointer is kept.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index bb9d95ef0707f497bc5cc8709b860c0b9dd49b6d..5d5c2bce01f3d241dded1d40c724a55d6bee2b08 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -534,7 +534,6 @@ static void vmw_user_bo_release(struct ttm_base_object **p_base)
 {
        struct vmw_user_buffer_object *vmw_user_bo;
        struct ttm_base_object *base = *p_base;
-       struct ttm_buffer_object *bo;
 
        *p_base = NULL;
 
@@ -543,8 +542,7 @@ static void vmw_user_bo_release(struct ttm_base_object **p_base)
 
        vmw_user_bo = container_of(base, struct vmw_user_buffer_object,
                                   prime.base);
-       bo = &vmw_user_bo->vbo.base;
-       ttm_bo_unref(&bo);
+       ttm_bo_put(&vmw_user_bo->vbo.base);
 }
 
 
@@ -597,7 +595,6 @@ int vmw_user_bo_alloc(struct vmw_private *dev_priv,
                      struct ttm_base_object **p_base)
 {
        struct vmw_user_buffer_object *user_bo;
-       struct ttm_buffer_object *tmp;
        int ret;
 
        user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
@@ -615,7 +612,6 @@ int vmw_user_bo_alloc(struct vmw_private *dev_priv,
                return ret;
 
        ttm_bo_get(&user_bo->vbo.base);
-       tmp = &user_bo->vbo.base;
        ret = ttm_prime_object_init(tfile,
                                    size,
                                    &user_bo->prime,
@@ -624,7 +620,7 @@ int vmw_user_bo_alloc(struct vmw_private *dev_priv,
                                    &vmw_user_bo_release,
                                    &vmw_user_bo_ref_obj_release);
        if (unlikely(ret != 0)) {
-               ttm_bo_unref(&tmp);
+               ttm_bo_put(&user_bo->vbo.base);
                goto out_no_base_object;
        }
 

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
index 48d1380a952e2d918f379fc27b6aa83258607a85..70dab55e78887220b9f235f28c4cf1f9096097c1 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
@@ -765,7 +765,7 @@ static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
 
        if (info->done)
                return true;
- 
+
        memset(info->node, 0, sizeof(*info->node));
        spin_lock(&man->lock);
        ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
@@ -1276,8 +1276,10 @@ int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
        return 0;
 
 out_no_map:
-       if (man->using_mob)
-               ttm_bo_unref(&man->cmd_space);
+       if (man->using_mob) {
+               ttm_bo_put(man->cmd_space);
+               man->cmd_space = NULL;
+       }
 
        return ret;
 }
@@ -1380,7 +1382,8 @@ void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
        (void) vmw_cmdbuf_idle(man, false, 10*HZ);
        if (man->using_mob) {
                (void) ttm_bo_kunmap(&man->map_obj);
-               ttm_bo_unref(&man->cmd_space);
+               ttm_bo_put(man->cmd_space);
+               man->cmd_space = NULL;
        } else {
                dma_free_coherent(&man->dev_priv->dev->pdev->dev,
                                  man->size, man->map, man->handle);

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index b7fb9b79bfef13feec810459b32071ca1f144d96..accb2fafe2f13ea4c940d950d18adf57d77d2f7a 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -1337,9 +1337,7 @@ static inline void vmw_bo_unreference(struct vmw_buffer_object **buf)
 
        *buf = NULL;
        if (tmp_buf != NULL) {
-               struct ttm_buffer_object *bo = &tmp_buf->base;
-
-               ttm_bo_unref(&bo);
+               ttm_bo_put(&tmp_buf->base);
        }
 }
 

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_mob.c b/drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
index 7ed179d30ec51f073e16d0bb8eaab0ee784116a8..d83cc66e12104d5794a38b33652a6062894e048b 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
@@ -300,7 +300,8 @@ out_no_setup:
                                                 &batch->otables[i]);
        }
 
-       ttm_bo_unref(&batch->otable_bo);
+       ttm_bo_put(batch->otable_bo);
+       batch->otable_bo = NULL;
 out_no_bo:
        return ret;
 }
@@ -365,7 +366,8 @@ static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
        vmw_bo_fence_single(bo, NULL);
        ttm_bo_unreserve(bo);
 
-       ttm_bo_unref(&batch->otable_bo);
+       ttm_bo_put(batch->otable_bo);
+       batch->otable_bo = NULL;
 }
 
 /*
@@ -463,7 +465,8 @@ static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
 
 out_unreserve:
        ttm_bo_unreserve(mob->pt_bo);
-       ttm_bo_unref(&mob->pt_bo);
+       ttm_bo_put(mob->pt_bo);
+       mob->pt_bo = NULL;
 
        return ret;
 }
@@ -580,8 +583,10 @@ static void vmw_mob_pt_setup(struct vmw_mob *mob,
  */
 void vmw_mob_destroy(struct vmw_mob *mob)
 {
-       if (mob->pt_bo)
-               ttm_bo_unref(&mob->pt_bo);
+       if (mob->pt_bo) {
+               ttm_bo_put(mob->pt_bo);
+               mob->pt_bo = NULL;
+       }
        kfree(mob);
 }
 
@@ -698,8 +703,10 @@ int vmw_mob_bind(struct vmw_private *dev_priv,
 
 out_no_cmd_space:
        vmw_fifo_resource_dec(dev_priv);
-       if (pt_set_up)
-               ttm_bo_unref(&mob->pt_bo);
+       if (pt_set_up) {
+               ttm_bo_put(mob->pt_bo);
+               mob->pt_bo = NULL;
+       }
 
        return -ENOMEM;
 }

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index d67b928adf6a641d0b69eb68443cef9699929172..a7c30e567f0941ddfda8d89b9fb34a9885cbe715 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -485,7 +485,8 @@ vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
 out_no_validate:
        ttm_eu_backoff_reservation(ticket, &val_list);
 out_no_reserve:
-       ttm_bo_unref(&val_buf->bo);
+       ttm_bo_put(val_buf->bo);
+       val_buf->bo = NULL;
        if (backup_dirty)
                vmw_bo_unreference(&res->backup);
 
@@ -545,7 +546,8 @@ vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket,
        INIT_LIST_HEAD(&val_list);
        list_add_tail(&val_buf->head, &val_list);
        ttm_eu_backoff_reservation(ticket, &val_list);
-       ttm_bo_unref(&val_buf->bo);
+       ttm_bo_put(val_buf->bo);
+       val_buf->bo = NULL;
 }
 
 /**

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
index b3f547fc5d3d849c8483d95283a3ba33e5126039..e9944ac2e057feece6c02a126d34825a2b60b3b9 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
@@ -628,8 +628,10 @@ void vmw_validation_unref_lists(struct vmw_validation_context *ctx)
        struct vmw_validation_bo_node *entry;
        struct vmw_validation_res_node *val;
 
-       list_for_each_entry(entry, &ctx->bo_list, base.head)
-               ttm_bo_unref(&entry->base.bo);
+       list_for_each_entry(entry, &ctx->bo_list, base.head) {
+               ttm_bo_put(entry->base.bo);
+               entry->base.bo = NULL;
+       }
 
        list_splice_init(&ctx->resource_ctx_list, &ctx->resource_list);
        list_for_each_entry(val, &ctx->resource_list, head)