linux-kernel - Re: [PATCH v2 1/2] dmaengine: qcom_hidma: initialize tx flags in hidma_prep_dma

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Date:   Sun, 20 Jan 2019 10:44:05 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Shunyong Yang <shunyong.yang@...-semitech.com>
Cc:     okaya@...nel.org, andy.gross@...aro.org, david.brown@...aro.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Joey Zheng <yu.zheng@...-semitech.com>
Subject: Re: [PATCH v2 1/2] dmaengine: qcom_hidma: initialize tx flags in
 hidma_prep_dma_*

On 07-01-19, 09:32, Shunyong Yang wrote:
> 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.

Applied both, thanks

-- 
~Vinod