26e30050d5c79b2d41274211550a14cb04 author Stephen Warren 1294262652 -0700 committer Colin Cross 1298154952 -0800 ARM: tegra: Prevent requeuing in-progress DMA requests If a request already in the queue is passed to tegra_dma_enqueue_req, tegra_dma_req.node->{next,prev} will end up pointing to itself instead of at tegra_dma_channel.list, which is the way a the end-of-list should be set up. When the DMA request completes and is list_del'd, the list head will still point at it, yet the node's next/prev will contain the list poison values. When the next DMA request completes, a kernel panic will occur when those poison values are dereferenced. This makes the DMA driver more robust in the face of buggy clients. Signed-off-by: Stephen Warren Signed-off-by: Colin Cross mě<=—