[PATCH 3/4] spi: stm32: properly fail on dma_request_chan error

[Mark Brown]

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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