linux-kernel - Re: [PATCH v1 1/1] spi: Remove unneded check for orig

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Message-ID: <8ae675b5-fcf9-4c9b-b06a-4462f70e1322@linaro.org>
Date: Wed, 22 May 2024 12:03:33 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] spi: Remove unneded check for orig_nents

Hi,

On 15/05/2024 23:09, Nícolas F. R. A. Prado wrote:
> On Tue, May 07, 2024 at 11:10:27PM +0300, Andy Shevchenko wrote:
>> Both dma_unmap_sgtable() and sg_free_table() in spi_unmap_buf_attrs()
>> have checks for orig_nents against 0. No need to duplicate this.
>> All the same applies to other DMA mapping API calls.
>>
>> Also note, there is no other user in the kernel that does this kind of
>> checks.
>>
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> Hi,
> 
> this commit caused a regression which I reported here:
> 
> https://lore.kernel.org/all/d3679496-2e4e-4a7c-97ed-f193bd53af1d@notapiano
> 
> along with some thoughts on the cause and a possible solution, though I'm not
> familiar with this code base at all and would really appreciate any feedback you
> may have.

I also see the same regression on the SM8550 and SM8650 platforms,
please CC linux-arm-msm@...r.kernel.org and me for a potential fix to test on those platforms.

Thanks,
Neil

> 
> Thanks,
> Nícolas
>