From 0c0eb4caf03bb6d3d92c70560e0530c8fdf62284 Mon Sep 17 00:00:00 2001 From: Zi Yan Date: Mon, 8 Jan 2018 10:50:50 -0500 Subject: [PATCH] dmaengine: avoid map_cnt overflow with CONFIG_DMA_ENGINE_RAID When CONFIG_DMA_ENGINE_RAID is enabled, unmap pool size can reach to 256. But in struct dmaengine_unmap_data, map_cnt is only u8, wrapping to 0, if the unmap pool is maximally used. This triggers BUG() when struct dmaengine_unmap_data is freed. Use u16 to fix the problem. Signed-off-by: Zi Yan Signed-off-by: Vinod Koul --- include/linux/dmaengine.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index f838764993eb..861be5cab1df 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -470,7 +470,11 @@ typedef void (*dma_async_tx_callback_result)(void *dma_async_param, const struct dmaengine_result *result); struct dmaengine_unmap_data { +#if IS_ENABLED(CONFIG_DMA_ENGINE_RAID) + u16 map_cnt; +#else u8 map_cnt; +#endif u8 to_cnt; u8 from_cnt; u8 bidi_cnt; -- 2.30.2