linux-kernel - Re: [PATCH v2 01/11] crypto: introduce crypto wait for async op

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Date:   Sat, 10 Jun 2017 11:43:37 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>, Steve French <sfrench@...ba.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Ofir Drang <ofir.drang@....com>,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        linux-crypto@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-fscrypt@...r.kernel.org,
        linux-ima-devel@...ts.sourceforge.net,
        linux-ima-user@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v2 01/11] crypto: introduce crypto wait for async op

On Mon, May 29, 2017 at 11:22:48AM +0300, Gilad Ben-Yossef wrote:
>
> +static inline int crypto_wait_req(int err, struct crypto_wait *wait)
> +{
> +	switch (err) {
> +	case -EINPROGRESS:
> +	case -EBUSY:
> +		wait_for_completion(&wait->completion);
> +		reinit_completion(&wait->completion);
> +		err = wait->err;
> +		break;
> +	};
> +
> +	return err;
> +}

This assumes that the request is used with backlog.  For non-backlog
requests this would result in a memory leak as EBUSY in that case is
a fatal error.

So this API can't be used without backlog.

We could introduce a flag to indicate whether we want backlog or not,
or maybe we should change our API so that in the non-backlog case we
return something other than EBUSY.

Opinions?

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