tree 165300d7a57375dddcf52d8f9049a33797981949
parent 7928b2cbe55b2a410a0f5c1f154610059c57b1b2
author Zi Yan <zi.yan@cs.rutgers.edu> 1515426650 -0500
committer Vinod Koul <vinod.koul@intel.com> 1518407336 +0530

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 <zi.yan@cs.rutgers.edu>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>