Linux kernel stable tree https://git.rulkc.org/pub/scm/linux/kernel/git/stable/linux.git/atom?h=master 2026-08-14T15:48:52+00:00 2026-08-14T15:48:52+00:00 Honghui Jiang jiang_hh2019@163.com 2026-08-14T03:14:18+00:00 urn:sha1:9b81a87c5244bc139357460a262d4536226ba41d 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. Signed-off-by: Honghui Jiang <jiang_hh2019@163.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20260814031419.43378-5-jiang_hh2019@163.com Signed-off-by: Mark Brown <broonie@kernel.org>