linux-kernel - Re: [PATCH v2] hwrng: exynos - Fix runtime PM imbalance on error

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <cdeb89aa-d876-f00d-529c-95456c5b2397@samsung.com>
Date:   Thu, 22 Apr 2021 13:19:46 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Łukasz Stelmach <l.stelmach@...sung.com>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-samsung-soc@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Bartłomiej Żolnierkiewicz 
        <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2] hwrng: exynos - Fix runtime PM imbalance on error

On 22.04.2021 12:46, Krzysztof Kozlowski wrote:
> On 22/04/2021 12:41, Łukasz Stelmach wrote:
>> pm_runtime_get_sync() increments the runtime PM usage counter even
>> the call returns an error code. Thus a pairing decrement is needed
>> on the error handling path to keep the counter balanced.
> It's exactly the same as Dinghao's patch:
> https://lore.kernel.org/linux-samsung-soc/20200522011659.26727-1-dinghao.liu@zju.edu.cn/
> which you reviewed. It has even the same commit msg
> (although it's difficult to be creative here).
>
> I think it's better to resend his patch instead.

Frankly speaking I would get rid of the pm_runtime_get_sync() calls in 
the drivers and replace them with pm_runtime_resume_and_get() to finish 
that never ending pm_runtime get/put misunderstanding soap opea...

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland