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drm/vmwgfx: Replace ttm_bo_unref with ttm_bo_put

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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>
This commit is contained in:
Thomas Zimmermann
2019-01-25 12:02:09 +01:00
committed by Alex Deucher
parent 2d18cb98d6
commit 6034d9d48e
6 changed files with 32 additions and 24 deletions
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21
drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
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@@ -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;
}