diff options
| author | Xuelin Shi <xuelin.shi@freescale.com> | 2014-05-21 14:02:37 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2014-05-21 14:02:37 -0700 |
| commit | c1f43dd9c20d85e66c4d77e284f64ac114abe3f8 (patch) | |
| tree | ee4ff99c2742b037071435d9dc0423eb3650da51 /drivers/dma | |
| parent | 5a9a55bf9157d3490b0c8c4c81d4708602c26e07 (diff) | |
dmaengine: fix dmaengine_unmap failure
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>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dmaengine.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index a886713937f..d5d30ed863c 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -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; } |