[stgt] [PATCH] fix bugs in persistent group reservations

[Alexander Nezhinsky]

> +static inline int list_is_last(const struct list_head *list,
> +                              const struct list_head *head)
> +{
> +       return list->next == head;
> +}

Can't we just use list_add() instead of list_add_tail() in spc_pr_register():
      list_add_tail(&reg->registration_siblings,
                        &cmd->dev->registration_list);
then we don't need to introduce list_is_last() and manage it with
list_first_entry() ?


> +static void __unregister_and_clean(struct scsi_cmd *cmd,
> +                                  struct registration *reg)
> +{
. . .
> +       if (!is_pr_type_all_registrants(holder->pr_type) ||
> +            list_is_last(&reg->registration_siblings,
> +                &reg->registration_siblings)) {

Isn't it supposed to be:
> +            list_is_last(&reg->registration_siblings,
> +                &cmd->dev->registration_list)) {
?

Another thing, i'd suggest making a separate patch for
is_pr_type_all_registrants()
because it is a refactoring-like stuff and quite separate from other additions
and fixes.

Alexander
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