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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: John Mathew <john.mathew@unikie.com>
Cc: linux-rt-users@vger.kernel.org, lukas.bulwahn@gmail.com
Subject: Re: [PATCH] crypto: only wait for completion once
Date: Tue, 14 Jan 2020 13:47:32 +0100
Message-ID: <20200114124732.mbw6lfrajmaxjkce@linutronix.de> (raw)
In-Reply-To: <20191231100051.658-1-john.mathew@unikie.com>

On 2019-12-31 12:00:51 [+0200], John Mathew wrote:
> Proposed fix for the swake_up_all_locked warnings issue discussed in
> Link: https://lore.kernel.org/linux-rt-users/20191218165334.k4suur4gzlu62ibs@linutronix.de/T/#t
> Currently multiple wait for completions are scheduled for the same algo.
> Only one completes and the rest are returned with ENOENT. This patch
> checks for the name of the algorithm going to be waited up on, and if
> the algorithm is already being waited for completion return EAGAIN ,
> without accumulating completions and returning ENOENT.

Have you tested this patch and if so how?

> Signed-off-by: John Mathew <john.mathew@unikie.com>
> ---
>  crypto/api.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/crypto/api.c b/crypto/api.c
> index d8ba54142620..1c6004e7ab6c 100644
> --- a/crypto/api.c
> +++ b/crypto/api.c
> @@ -234,8 +234,12 @@ static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type,
>  		alg = crypto_alg_lookup(name, type, mask);
>  	}
>  
> -	if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))
> -		alg = crypto_larval_wait(alg);
> +	if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))	{
> +		if (!strcmp(alg->cra_name, name))
> +			alg = ERR_PTR(-EAGAIN);
> +		else
> +			alg = crypto_larval_wait(alg);
> +	}
>  	else if (!alg)
>  		alg = crypto_larval_add(name, type, mask);
>  
Sebastian

      reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11  7:17 complete_all() with x waiters in swake_up_all_locked John Mathew
2019-12-12 17:12 ` Sebastian Andrzej Siewior
2019-12-13  9:08   ` John Mathew
2019-12-18 16:53     ` Sebastian Andrzej Siewior
2019-12-31 10:00       ` [PATCH] crypto: only wait for completion once John Mathew
2020-01-14 12:47         ` Sebastian Andrzej Siewior [this message]

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