linux-kernel - Re: [PATCH v6 0/4] can: esd: add support for esd GmbH PCIe/402 CAN interface

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Message-ID: <20220125162507.sxjzjk5pqdpppxsl@pengutronix.de>
Date:   Tue, 25 Jan 2022 17:25:07 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Stefan Mätje <stefan.maetje@....eu>
Cc:     linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/4] can: esd: add support for esd GmbH PCIe/402 CAN
 interface

On 01.12.2021 23:03:24, Stefan Mätje wrote:
> *Note*: scripts/checkpatch.pl still emits the following warnings:
>   - esd_402_pci-core.c:270: Possible unnecessary 'out of memory' message
>     This error message is there to tell the user that the DMA allocation
>     failed and not an allocation for normal kernel memory.

The kernel takes care of printing a error message in case the DMA mem
allocation fails. This is why checkpatch asks you to remove that message.

>   - esdacc.h:255: The irq_cnt pointer is still declared volatile and
>     this has a reason and is explained in detail in the header
>     referencing the exception noted in volatile-considered-harmful.rst.

I'll look into this, I'll probably ask you to explain the IRQ demux to
me :)

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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