spi dma race

The tag 'spi dma race' covers a specific Linux kernel vulnerability, CVE-2026-31485, which is a use-after-free-style teardown race in the spi-fsl-lpspi driver. This race condition occurs when DMA transfers are still in flight during controller removal, leading to potential NULL dereference or memory corruption. The fix involves changing the order of controller registration and removal to prevent DMA teardown from colliding with active transfers. This issue is relevant for embedded or appliance-class Linux systems using the affected SPI driver. Discussions focus on the technical details of the race, the upstream patch, and implications for system stability and security.