linux-kernel - Re: [PATCH v9 4/5] spi: dw: Add DMA address widths capability check

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Message-ID: <ZFj2QraXvNqBRwqM@finisterre.sirena.org.uk>
Date:   Mon, 8 May 2023 22:16:50 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Joy Chakraborty <joychakr@...gle.com>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        manugautam@...gle.com, rohitner@...gle.com
Subject: Re: [PATCH v9 4/5] spi: dw: Add DMA address widths capability check

On Thu, Apr 27, 2023 at 12:33:13PM +0000, Joy Chakraborty wrote:
> Store address width capabilities of DMA controller during init and check
> the same per transfer to make sure the bits/word requirement can be met.
> 
> Current DW DMA driver requires both tx and rx channel to be configured
> and functional hence a subset of both tx and rx channel address width
> capability is checked with the width requirement(n_bytes) for a
> transfer.

This breaks an x86 allmodconfig build:

/build/stage/linux/drivers/spi/spi-dw-dma.c: In function ‘dw_spi_dma_caps_init’:
/build/stage/linux/drivers/spi/spi-dw-dma.c:100:1: error: control reaches end of non-void function [-Werror=return-type]
  100 | }
      | ^
cc1: some warnings being treated as errors

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