linux-kernel - [PATCH 4/7] dmaengine: sprd: Set cur_desc as NULL when free or terminate one dma channel

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Date:   Sat, 29 Sep 2018 13:49:02 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     dan.j.williams@...el.com, vkoul@...nel.org,
        eric.long@...eadtrum.com
Cc:     broonie@...nel.org, baolin.wang@...aro.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] dmaengine: sprd: Set cur_desc as NULL when free or terminate one dma channel

From: Eric Long <eric.long@...eadtrum.com>

It will be failed to start one new transfer if the channel started one
none interrupt transfer before, since we will only set the schan->cur_desc
as NULL depending on the transfer interrupt now. Thus we should set
schan->cur_desc as NULL when free or terminate one dma channel to
avoid this issue.

Signed-off-by: Eric Long <eric.long@...eadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index e6a74dc..1b39661 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -439,6 +439,7 @@ static void sprd_dma_stop(struct sprd_dma_chn *schan)
 	sprd_dma_stop_and_disable(schan);
 	sprd_dma_unset_uid(schan);
 	sprd_dma_clear_int(schan);
+	schan->cur_desc = NULL;
 }
 
 static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc,
-- 
1.7.9.5