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dmaengine: fix dmaengine_unmap failure

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The count which is used to get_unmap_data maybe not the same as the
count computed in dmaengine_unmap which causes to free data in a
wrong pool.

This patch fixes this issue by keeping the map count with unmap_data
structure and use this count to get the pool.

Cc: <stable@vger.kernel.org>
Signed-off-by: Xuelin Shi <xuelin.shi@freescale.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Xuelin Shi
2014-05-21 14:02:37 -07:00
committed by Dan Williams
parent 5a9a55bf91
commit c1f43dd9c2
2 changed files with 3 additions and 0 deletions
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include/linux/dmaengine.h
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@@ -429,6 +429,7 @@ typedef bool (*dma_filter_fn)(struct dma_chan *chan, void *filter_param);
typedef void (*dma_async_tx_callback)(void *dma_async_param);
struct dmaengine_unmap_data {
u8 map_cnt;
u8 to_cnt;
u8 from_cnt;
u8 bidi_cnt;