dmaengine: sprd: Set cur_desc as NULL when free or terminate one dma channel

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@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index e6a74dc7da958d116ff12c8ffc3b6d1c9eef2fc9..1b39661cd17b7d090daffca0e342581163271326 100644 (file)
--- 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,