Re: [PATCH v2 4/4] spi: Add KUnit coverage for DMA mapping error paths

[Andy Shevchenko]

On Fri, Aug 14, 2026 at 11:14:18AM +0800, Honghui Jiang wrote:
> Add KUnit tests for the __spi_map_msg() error paths. The tests verify
> that a later TX or RX mapping failure clears the mapping state of
> earlier transfers and leaves cur_{tx,rx}_dma_dev identifying the
> current mapping device.
> 
> A zero-length transfer causes sg_alloc_table() to return -EINVAL,
> providing deterministic failure injection without test hooks.
> Additional cases cover successful map/unmap and a message which
> requires no mapping.
> 
> Build the DMA suite as a separate translation unit, exposing the two
> internal mapping helpers only for KUnit through the local internal
> header. Enable SPI in the default and all-tests KUnit configurations so
> the suite is exercised there.

...

> +++ b/tools/testing/kunit/configs/default.config
> @@ -1,3 +1,4 @@
>  CONFIG_KUNIT=y
>  CONFIG_KUNIT_EXAMPLE_TEST=y
>  CONFIG_KUNIT_ALL_TESTS=y
> +CONFIG_SPI=y

This is a stray change.

-- 
With Best Regards,
Andy Shevchenko