linux-kernel - Re: [PATCH 3/4] spi: stm32: properly fail on dma_request

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Message-ID: <6c153ddd-a586-4138-b3c4-793278d93305@sirena.org.uk>
Date: Thu, 18 Dec 2025 08:57:36 +0000
From: Mark Brown <broonie@...nel.org>
To: Alain Volmat <alain.volmat@...s.st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-spi@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 3/4] spi: stm32: properly fail on dma_request_chan error

On Thu, Dec 18, 2025 at 09:38:40AM +0100, Alain Volmat wrote:
> On Thu, Dec 18, 2025 at 08:00:57AM +0000, Mark Brown wrote:

> > Bug fixes should go at the start of serieses to avoid spurious
> > dependencies on new or cleanup changes.

> Actually I wasn't thinking about requiring this commit to go into
> stable branches. Without commit, the driver will still work even if
> there is an issue to request a dma channel since it will fallback to
> interrupt based transfers.
> This commit makes the error visible now, ensuring that if the
> device-tree indicates that a DMA should be used, it will either be used
> or probe will fail.

I'd not send it to stable either (admittedly I generally stopped tagging
stuff for stable entirely) but I will apply it for v6.19.

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