netdev - Re: [PATCH v2 3/3] drivers: crypto: add the Virtual Function driver for OcteonTX2 CPT

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Date:   Thu, 13 Aug 2020 10:58:59 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Srujana Challa <schalla@...vell.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, schandran@...vell.com,
        pathreya@...vell.com, sgoutham@...vell.com, lcherian@...vell.com,
        gakula@...vell.com, jerinj@...vell.com
Subject: Re: [PATCH v2 3/3] drivers: crypto: add the Virtual Function driver
 for OcteonTX2 CPT

On Fri, Aug 07, 2020 at 07:39:20PM +0530, Srujana Challa wrote:
>
> +static inline int is_any_alg_used(void)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(otx2_cpt_skciphers); i++)
> +		if (refcount_read(&otx2_cpt_skciphers[i].base.cra_refcnt) != 1)
> +			return true;
> +	for (i = 0; i < ARRAY_SIZE(otx2_cpt_aeads); i++)
> +		if (refcount_read(&otx2_cpt_aeads[i].base.cra_refcnt) != 1)
> +			return true;
> +	return false;
> +}

This is racy as there is nothing stopping new users from coming in
after you've finished the test.

Cheers,
-- 
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