dmaengine: avoid map_cnt overflow with CONFIG_DMA_ENGINE_RAID
From: Vinod Koul <hidden>
Date: 2018-02-05 05:34:54
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On Mon, Jan 08, 2018 at 10:50:50AM -0500, Zi Yan wrote:
From: Zi Yan <redacted> 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.
Applied, thanks