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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: <[email protected]>
Signed-off-by: Xuelin Shi <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Xuelin Shi 2014-05-21 14:02:37 -07:00 • committed by Dan Williams
commit c1f43dd9c2
2 changed files with 3 additions and 0 deletions
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2
drivers/dma/dmaengine.c
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@ -1009,6 +1009,7 @@ static void dmaengine_unmap(struct kref *kref)
dma_unmap_page(dev, unmap->addr[i], unmap->len,
DMA_BIDIRECTIONAL);
}
cnt = unmap->map_cnt;
mempool_free(unmap, __get_unmap_pool(cnt)->pool);
}
@ -1074,6 +1075,7 @@ dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags)
memset(unmap, 0, sizeof(*unmap));
kref_init(&unmap->kref);
unmap->dev = dev;
unmap->map_cnt = nr;
return unmap;
}