In async_tx_test_ack(), it uses flags in struct dma_async_tx_descriptor to check the ACK status. As hidma reuses the descriptor in a free list when hidma_prep_dma_*(memcpy/memset) is called, the flag will keep ACKed if the descriptor has been used before. This will cause a BUG_ON in async_tx_quiesce(). kernel BUG at crypto/async_tx/async_tx.c:282! Internal error: Oops - BUG: 0 1 SMP ... task: ffff8017dd3ec000 task.stack: ffff8017dd3e8000 PC is at async_tx_quiesce+0x54/0x78 [async_tx] LR is at async_trigger_callback+0x98/0x110 [async_tx] This patch initializes flags in dma_async_tx_descriptor by the flags passed from the caller when hidma_prep_dma_*(memcpy/memset) is called. Cc: Joey Zheng <yu.zheng@xxxxxxxxxxxxxxxx> Signed-off-by: Shunyong Yang <shunyong.yang@xxxxxxxxxxxxxxxx> --- drivers/dma/qcom/hidma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c index 43d4b00b8138..9d639ed1955a 100644 --- a/drivers/dma/qcom/hidma.c +++ b/drivers/dma/qcom/hidma.c @@ -415,6 +415,7 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach) if (!mdesc) return NULL; + mdesc->desc.flags = flags; hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch, src, dest, len, flags, HIDMA_TRE_MEMCPY); @@ -447,6 +448,7 @@ static int hidma_alloc_chan_resources(struct dma_chan *dmach) if (!mdesc) return NULL; + mdesc->desc.flags = flags; hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch, value, dest, len, flags, HIDMA_TRE_MEMSET); -- 1.8.3.1
