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

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Message-ID: <20220421071056.4o33vlhoqarod3ow@ti.com>
Date:   Thu, 21 Apr 2022 12:40:56 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Mark Brown <broonie@...nel.org>
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 20/04/22 02:04PM, Mark Brown wrote:
> 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?

Yes, you should be able to apply it directly. Miquel's spi-mem-ecc 
branch is now in 5.18-rc1 and later. Though this patch never conflicted 
with that branch to begin with. The spi-mem-ecc branch does not touch 
spi_mem_check_op() as far as I can see.

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.