Matt Helsley wrote:
> Not every use of deferqueue will have a destructor function so
> we need to check it before calling it.
> 
> Signed-off-by: Matt Helsley <[email protected]>

Yup.

Acked-by: Oren Laadan <[email protected]>

> ---
>  kernel/deferqueue.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/deferqueue.c b/kernel/deferqueue.c
> index 3fb388b..1204c8b 100644
> --- a/kernel/deferqueue.c
> +++ b/kernel/deferqueue.c
> @@ -53,7 +53,8 @@ void deferqueue_destroy(struct deferqueue_head *h)
>  
>               pr_debug("%s: freeing non-empty queue\n", __func__);
>               list_for_each_entry_safe(dq, n, &h->list, list) {
> -                     dq->destructor(dq->data);
> +                     if (dq->destructor)
> +                             dq->destructor(dq->data);
>                       list_del(&dq->list);
>                       kfree(dq);
>               }
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