From: Eric Biggers <ebiggers@kernel.org>
To: Tero Kristo <t-kristo@ti.com>
Cc: herbert@gondor.apana.org.au, davem@davemloft.net,
linux-crypto@vger.kernel.org, ard.biesheuvel@linaro.org,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 09/10] crypto: add timeout to crypto_wait_req
Date: Tue, 5 Nov 2019 09:42:00 -0800 [thread overview]
Message-ID: <20191105174200.GC757@sol.localdomain> (raw)
In-Reply-To: <20191017122549.4634-10-t-kristo@ti.com>
On Thu, Oct 17, 2019 at 03:25:48PM +0300, Tero Kristo wrote:
> Currently crypto_wait_req waits indefinitely for an async crypto request
> to complete. This is bad as it can cause for example the crypto test
> manager to hang without any notification as to why it has happened.
> Instead of waiting indefinitely, add a 1 second timeout to the call,
> and provide a warning print if a timeout happens.
>
> Signed-off-by: Tero Kristo <t-kristo@ti.com>
> ---
> include/linux/crypto.h | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/crypto.h b/include/linux/crypto.h
> index 19ea3a371d7b..b8f0e5c3cc0c 100644
> --- a/include/linux/crypto.h
> +++ b/include/linux/crypto.h
> @@ -682,8 +682,15 @@ static inline int crypto_wait_req(int err, struct crypto_wait *wait)
> switch (err) {
> case -EINPROGRESS:
> case -EBUSY:
> - wait_for_completion(&wait->completion);
> + err = wait_for_completion_timeout(&wait->completion,
> + msecs_to_jiffies(1000));
> reinit_completion(&wait->completion);
> + if (!err) {
> + pr_err("%s: timeout for %p\n", __func__, wait);
> + err = -ETIMEDOUT;
> + break;
> + }
> +
> err = wait->err;
> break;
> };
I'm not sure this is a good idea, because operations could legitimately take a
long time, e.g. if someone passes in a huge data buffer. How do you know that X
amount of time is always going to be enough?
- Eric
next prev parent reply other threads:[~2019-11-05 17:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 12:25 [PATCH 00/10] crypto: omap fixes towards 5.5 Tero Kristo
2019-10-17 12:25 ` [PATCH 01/10] crypto: omap-sham: split up data to multiple sg elements with huge data Tero Kristo
2019-10-17 12:25 ` [PATCH 02/10] crypto: omap-sham: remove the sysfs group during driver removal Tero Kristo
2019-10-17 12:25 ` [PATCH 03/10] crypto: omap-aes: " Tero Kristo
2019-10-17 12:25 ` [PATCH 04/10] crypto: omap-des: add IV output handling Tero Kristo
2019-10-17 12:25 ` [PATCH 05/10] crypto: omap-aes: " Tero Kristo
2019-10-17 12:25 ` [PATCH 06/10] crypto: omap-sham: fix buffer handling for split test cases Tero Kristo
2019-10-17 12:25 ` [PATCH 07/10] crypto: omap-aes-gcm: fix corner case with only auth data Tero Kristo
2019-10-26 15:04 ` Ard Biesheuvel
2019-10-17 12:25 ` [PATCH 08/10] crypto: omap-sham: fix split update cases with cryptomgr tests Tero Kristo
2019-10-17 12:25 ` [PATCH 09/10] crypto: add timeout to crypto_wait_req Tero Kristo
2019-11-05 17:42 ` Eric Biggers [this message]
2019-11-06 6:39 ` Gilad Ben-Yossef
2019-11-06 7:25 ` Tero Kristo
2019-11-06 7:33 ` Gilad Ben-Yossef
2019-11-08 2:27 ` Eric Biggers
2019-11-08 7:40 ` Tero Kristo
2019-11-08 9:16 ` Herbert Xu
2019-11-08 9:22 ` Tero Kristo
2019-11-09 2:27 ` Eric Biggers
2019-11-09 5:01 ` Herbert Xu
2019-10-17 12:25 ` [PATCH 10/10] crypto: omap-aes: fixup aligned data cleanup Tero Kristo
2019-10-25 11:33 ` [PATCH 00/10] crypto: omap fixes towards 5.5 Ard Biesheuvel
2019-10-25 11:55 ` Tero Kristo
2019-10-25 11:56 ` Tero Kristo
2019-10-25 12:05 ` Ard Biesheuvel
2019-10-25 12:18 ` Tero Kristo
2019-10-26 15:06 ` Ard Biesheuvel
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