Re: [PATCH] crypto: scompress - call the completion callback for the completed acomp_req

[Herbert Xu]

On Sun, Jun 21, 2020 at 11:07:56AM +1200, Barry Song wrote:
> While using acomp_req, users may customize a completion callback, if the
> backend of acomp is actually scomp, this callback will never be called.
> This looks a bit messy to users. For one user, all scomp details should
> be hidden by acomp APIs.
> 
> But it won't cause any real problem if users simply use crypto_req_done()
> as the callback, and further use crypto_wait_req() to wait for request to
> be done since crypto_wait_req() depends on the callback only if queuing
> acomp_req returns -EINPROGRESS or -EBUSY.
> 
> This patch will make sure the customized completion callback is called
> for the first case. And it won't break the second case in which users
> use the common crypto_req_done() and crypto_wait_req() only.
> 
> Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
> ---
>  crypto/scompress.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/crypto/scompress.c b/crypto/scompress.c
> index 738f4f8f0f41..634b7ced9348 100644
> --- a/crypto/scompress.c
> +++ b/crypto/scompress.c
> @@ -158,6 +158,10 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
>  	}
>  out:
>  	spin_unlock(&scratch->lock);
> +
> +	if (req->base.complete)
> +		acomp_request_complete(req, ret);
> +
>  	return ret;
>  }

Nack.  This is a deliberate optimisation to allow the sync code
path to execute with no overhead.

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