async_pq_val: fix DMA memory leak

Add missing dmaengine_unmap_put(), so we don't OOM during RAID6 sync.

Fixes: 1786b943dad0 ("async_pq_val: convert to dmaengine_unmap_data")
Signed-off-by: Justin Maggard <jmaggard@netgear.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
index 08b3ac68952b..f83de99d7d71 100644
--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -368,8 +368,6 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
 
                 dma_set_unmap(tx, unmap);
                 async_tx_submit(chan, tx, submit);
-
-                return tx;
         } else {
                 struct page *p_src = P(blocks, disks);
                 struct page *q_src = Q(blocks, disks);
@@ -424,9 +422,11 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
                 submit->cb_param = cb_param_orig;
                 submit->flags = flags_orig;
                 async_tx_sync_epilog(submit);
-
-                return NULL;
+                tx = NULL;
         }
+        dmaengine_unmap_put(unmap);
+
+        return tx;
 }
 EXPORT_SYMBOL_GPL(async_syndrome_val);