From: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
To: Martin Kaiser <martin@kaiser.cx>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
NXP Linux Team <linux-imx@nxp.com>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/6] hwrng: imx-rngc - use devres for registration
Date: Wed, 12 Feb 2020 21:43:55 +0530 [thread overview]
Message-ID: <CANc+2y6Scy1=S7zeQ4gVowRoWmzsq4wiNXbLVeY1Qvu0oo9cUw@mail.gmail.com> (raw)
In-Reply-To: <20200128110102.11522-4-martin@kaiser.cx>
Hi Martin,
On Tue, 28 Jan 2020 at 16:31, Martin Kaiser <martin@kaiser.cx> wrote:
>
> Use devres to register the rngc with the hwrng core. Drop the explicit
> deregistration.
>
> Signed-off-by: Martin Kaiser <martin@kaiser.cx>
> ---
> drivers/char/hw_random/imx-rngc.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
> index 903894518c8d..1381ddd5b891 100644
> --- a/drivers/char/hw_random/imx-rngc.c
> +++ b/drivers/char/hw_random/imx-rngc.c
> @@ -263,7 +263,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
> }
> }
>
> - ret = hwrng_register(&rngc->rng);
> + ret = devm_hwrng_register(&pdev->dev, &rngc->rng);
> if (ret) {
> dev_err(&pdev->dev, "FSL RNGC registering failed (%d)\n", ret);
> goto err;
> @@ -282,8 +282,6 @@ static int __exit imx_rngc_remove(struct platform_device *pdev)
> {
> struct imx_rngc *rngc = platform_get_drvdata(pdev);
>
> - hwrng_unregister(&rngc->rng);
> -
> clk_disable_unprepare(rngc->clk);
>
> return 0;
> --
> 2.20.1
>
After imx_rngc_remove function hwrng_unregister will get called. This
leaves a window where the clock to rng hardware block is disabled but
still user space can access it via /dev/hwrng. This does not look
right, please revisit the patch.
Regards,
PrasannaKumar
next prev parent reply other threads:[~2020-02-12 16:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 11:00 [PATCH 0/6] imx-rngc - several small fixes Martin Kaiser
2020-01-28 11:00 ` [PATCH 1/6] hwrng: imx-rngc - fix an error path Martin Kaiser
2020-02-12 16:22 ` PrasannaKumar Muralidharan
2020-01-28 11:00 ` [PATCH 2/6] hwrng: imx-rngc - use automatic seeding Martin Kaiser
2020-02-12 16:24 ` PrasannaKumar Muralidharan
2020-01-28 11:00 ` [PATCH 3/6] hwrng: imx-rngc - use devres for registration Martin Kaiser
2020-02-12 16:13 ` PrasannaKumar Muralidharan [this message]
2020-02-17 9:35 ` Martin Kaiser
2020-01-28 11:01 ` [PATCH 4/6] hwrng: imx-rngc - (trivial) simplify error prints Martin Kaiser
2020-02-12 16:24 ` PrasannaKumar Muralidharan
2020-01-28 11:01 ` [PATCH 5/6] hwrng: imx-rngc - check the rng type Martin Kaiser
2020-02-12 16:23 ` PrasannaKumar Muralidharan
2020-01-28 11:01 ` [PATCH 6/6] hwrng: imx-rngc - simplify interrupt mask/unmask Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 0/5] imx-rngc - several small fixes Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 1/5] hwrng: imx-rngc - fix an error path Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 2/5] hwrng: imx-rngc - use automatic seeding Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 3/5] hwrng: imx-rngc - (trivial) simplify error prints Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 4/5] hwrng: imx-rngc - check the rng type Martin Kaiser
2020-03-05 20:58 ` [PATCH v2 5/5] hwrng: imx-rngc - simplify interrupt mask/unmask Martin Kaiser
2020-03-12 12:39 ` [PATCH v2 0/5] imx-rngc - several small fixes Herbert Xu
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