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authorYuri Tikhonov <>2009-01-29 15:37:13 +0300
committerGreg Kroah-Hartman <>2009-02-02 09:53:29 -0800
commitf8b9d6d4e097b38b199253243b361bee9795cd14 (patch)
parent16a8b9e71cca9b79a79440ae0e08b39dbb4c8dd6 (diff)
dmaengine: fix dependency chaining
commit dd59b8537f6cb53ab863fafad86a5828f1e889a2 upstream ASYNC_TX: fix dependency chaining In ASYNC_TX we track the dependencies between the descriptors using the 'next' pointers of the structures. These pointers are set to NULL as soon as the corresponding descriptor has been submitted to the channel (in async_tx_run_dependencies()). But, the first 'next' in chain still remains set, regardless the fact, that tx->next is already submitted. This may lead to multiple submisions of the same descriptor. This patch fixes this. Signed-off-by: Yuri Tikhonov <> Signed-off-by: Dan Williams <> Signed-off-by: Greg Kroah-Hartman <>
1 files changed, 2 insertions, 0 deletions
diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index dcbf1be149f3..c5d71aad9ad0 100644
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -124,6 +124,8 @@ void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx)
if (!dep)
+ /* we'll submit tx->next now, so clear the link */
+ tx->next = NULL;
chan = dep->chan;
/* keep submitting up until a channel switch is detected