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vdpa: Add documentation for vdpa_alloc_device() macro

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The return value of vdpa_alloc_device() macro is not very
clear, so that most of callers did the wrong check. Let's
add some comments to better document it.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20210715080026.242-4-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Xie Yongji 2021-07-15 16:00:26 +08:00 committed by Michael S. Tsirkin
parent 1057afa012
commit c8d182bd38
1 changed files with 11 additions and 0 deletions
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11
include/linux/vdpa.h
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@ -277,6 +277,17 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
const struct vdpa_config_ops *config,
size_t size, const char *name);
/**
* vdpa_alloc_device - allocate and initilaize a vDPA device
*
* @dev_struct: the type of the parent structure
* @member: the name of struct vdpa_device within the @dev_struct
* @parent: the parent device
* @config: the bus operations that is supported by this device
* @name: name of the vdpa device
*
* Return allocated data structure or ERR_PTR upon error
*/
#define vdpa_alloc_device(dev_struct, member, parent, config, name) \
container_of(__vdpa_alloc_device( \
parent, config, \