linux-kernel - Re: [PATCH v2] spi: spi-mem: check if data buffers are on stack

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Message-ID: <YmAE2IVRgPyWxmbn@sirena.org.uk>
Date:   Wed, 20 Apr 2022 14:04:24 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Takahiro Kuwano <tkuw584924@...il.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] spi: spi-mem: check if data buffers are on stack

On Wed, Apr 20, 2022 at 03:50:22PM +0530, Pratyush Yadav wrote:
> The buffers passed in the data phase must be DMA-able. Programmers often
> don't realise this requirement and pass in buffers that reside on the
> stack. This can be hard to spot when reviewing code. Reject ops if their
> data buffer is on the stack to avoid this.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> Acked-by: Mark Brown <broonie@...nel.org>
> ---
> 
> Changes in v2:
> - Include task_stack.h. It might not get included indirectly on some
>   platforms and can cause build failures.
> - Add a WARN_ON_ONCE() for debuggability.
> - Add Mark's Ack.

Since this is now an isolated patch does that mean whatever meant that I
acked rather than applying this patch has gone in and I can now apply it
directly?

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