netdev - Re: [PATCH] rhashtable: add restart routine in rhashtable_free_and

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Date:   Wed, 4 Jul 2018 13:45:07 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Taehee Yoo <ap420073@...il.com>
Cc:     davem@...emloft.net, tgraf@...g.ch, netdev@...r.kernel.org,
        fw@...len.de, pablo@...filter.org
Subject: Re: [PATCH] rhashtable: add restart routine in
 rhashtable_free_and_destroy()

On Tue, Jul 03, 2018 at 10:19:09PM +0900, Taehee Yoo wrote:
>
> diff --git a/lib/rhashtable.c b/lib/rhashtable.c
> index 0e04947..8ea27fa 100644
> --- a/lib/rhashtable.c
> +++ b/lib/rhashtable.c
> @@ -1134,6 +1134,7 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
>  	mutex_lock(&ht->mutex);
>  	tbl = rht_dereference(ht->tbl, ht);
>  	if (free_fn) {
> +restart:
>  		for (i = 0; i < tbl->size; i++) {
>  			struct rhash_head *pos, *next;
>  
> @@ -1147,9 +1148,11 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
>  					rht_dereference(pos->next, ht) : NULL)
>  				rhashtable_free_one(ht, pos, free_fn, arg);
>  		}
> +		tbl = rht_dereference(tbl->future_tbl, ht);
> +		if (tbl)
> +			goto restart;
>  	}
> -
> -	bucket_table_free(tbl);
> +	bucket_table_free(rht_dereference(ht->tbl, ht));

Good catch.  But don't we need to call bucket_table_free on all
the tables too rather than just the first table?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt