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

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Date:   Mon, 7 Jan 2019 09:32:14 +0800
From:   Shunyong Yang <shunyong.yang@...-semitech.com>
To:     <vkoul@...nel.org>
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>,
        Shunyong Yang <shunyong.yang@...-semitech.com>,
        Joey Zheng <yu.zheng@...-semitech.com>
Subject: [PATCH v2 1/2] dmaengine: qcom_hidma: initialize tx flags in hidma_prep_dma_*

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@...-semitech.com>
Reviewed-by: Sinan Kaya <okaya@...nel.org>
Signed-off-by: Shunyong Yang <shunyong.yang@...-semitech.com>
---

v2: add Reviewed-by: Sinan Kaya <okaya@...nel.org>

---
 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