We will get a NULL virtual descriptor by vchan_find_desc() when the descriptor
has been submitted, that will crash the kernel when getting the engine status.
In this case, since the descriptor has been submitted, which means the pointer
'schan->cur_desc' will point to the current descriptor, then we can use
'schan->cur_desc' to get the engine status to avoid this issue.
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
---
drivers/dma/sprd-dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 48431e2..e29342a 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -625,7 +625,7 @@ static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
else
pos = 0;
} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
- struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
+ struct sprd_dma_desc *sdesc = schan->cur_desc;
if (sdesc->dir == DMA_DEV_TO_MEM)
pos = sprd_dma_get_dst_addr(schan);
--
1.7.9.5
