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drm/ast: Don't grab dev->struct_mutex for in mmap offset ioctl

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Since David Herrmann's mmap vma manager rework we don't need to grab
dev->struct_mutex any more to prevent races when looking up the mmap
offset. Drop it and instead don't forget to use the unref_unlocked
variant (since the drm core still cares).

Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-07-09 23:32:36 +02:00
parent 8d77a9404e
commit a66b2ea224
1 changed files with 5 additions and 11 deletions
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16
drivers/gpu/drm/ast/ast_main.c
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@ -571,24 +571,18 @@ ast_dumb_mmap_offset(struct drm_file *file,
uint64_t *offset)
{
struct drm_gem_object *obj;
int ret;
struct ast_bo *bo;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(dev, file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto out_unlock;
}
if (obj == NULL)
return -ENOENT;
bo = gem_to_ast_bo(obj);
*offset = ast_bo_mmap_offset(bo);
drm_gem_object_unreference(obj);
ret = 0;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
drm_gem_object_unreference_unlocked(obj);
return 0;
}