linux-kernel - Re: [PATCH 4/4] crypto: Documentation: fix none signal safe sample

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Date:   Tue, 16 May 2017 15:41:07 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Ofir Drang <ofir.drang@....com>,
        Gilad Ben-Yossef <gilad.benyossef@....com>,
        linux-crypto@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, keyrings@...r.kernel.org
Subject: Re: [PATCH 4/4] crypto: Documentation: fix none signal safe sample

On Thu, May 11, 2017 at 02:53:45PM +0300, Gilad Ben-Yossef wrote:
> The sample code was showing use of wait_for_completion_interruptible()
> for waiting for an async. crypto op to finish. However, if a signal
> arrived it would free the buffers used even while crypto HW might
> still DMA from/into the buffers.
> 
> Resolve this by using wait_for_completion() instead.
> 
> Reported-by: Eric Biggers <ebiggers3@...il.com>
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> ---
>  Documentation/crypto/api-samples.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/crypto/api-samples.rst b/Documentation/crypto/api-samples.rst
> index d021fd9..944f08b 100644
> --- a/Documentation/crypto/api-samples.rst
> +++ b/Documentation/crypto/api-samples.rst
> @@ -48,7 +48,7 @@ Code Example For Symmetric Key Cipher Operation
>              break;
>          case -EINPROGRESS:
>          case -EBUSY:
> -            rc = wait_for_completion_interruptible(
> +            rc = wait_for_completion(
>                  &sk->result.completion);
>              if (!rc && !sk->result.err) {
>                  reinit_completion(&sk->result.completion);
> -- 
> 2.1.4
> 

Same issue here: wait_for_completion() doesn't return a value.

Eric