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Subject: Re: dmaengine: stm32-mdma: call pm_runtime_put if pm_runtime_get_sync
 fails
To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Navid Emamdoost <navid.emamdoost@gmail.com>,
        dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-stm32@st-md-mailman.stormreply.com
Cc:     Alexandre Torgue <alexandre.torgue@st.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Navid Emamdoost <emamd001@umn.edu>, Kangjie Lu <kjlu@umn.edu>,
        Stephen McCamant <smccaman@umn.edu>,
        Qiushi Wu <wu000273@umn.edu>, Vinod Koul <vkoul@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
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From:   Markus Elfring <Markus.Elfring@web.de>
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Date:   Thu, 4 Jun 2020 07:43:14 +0200
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>>> Calling pm_runtime_get_sync increments the counter even in case of
>>> failure, causing incorrect ref count. Call pm_runtime_put if
>>> pm_runtime_get_sync fails.
>>
>> Is it appropriate to copy a sentence from the change description
>> into the patch subject?
>>
>> How do you think about a wording variant like the following?
>>
>>    The PM runtime reference counter is generally incremented by a call =
of
>>    the function =E2=80=9Cpm_runtime_get_sync=E2=80=9D.
>>    Thus call the function =E2=80=9Cpm_runtime_put=E2=80=9D also in two =
error cases
>>    to keep the reference counting consistent.
>
> IMHO the important part is "even in case of failure", which you dropped.
> Missing that point was the root cause of the issue being fixed.
> Hence I prefer the original description, FWIW.

Would you like to comment any more of the presented patch review concerns?

Can it make sense to combine any adjustments into a single patch
according to the discussed software transformation pattern?
https://lore.kernel.org/patchwork/project/lkml/list/?submitter=3D26544&sta=
te=3D*&q=3Dengine%3A+stm32&archive=3Dboth

Regards,
Markus