dmaengine: hisilicon: Fix CQ head update

[ Upstream commit 94477a7 ]

After completion of data transfer of one or multiple descriptors,
the completion status and the current head pointer to submission
queue are written into the CQ and interrupt can be generated to
inform the software. In interrupt process CQ is read and cq_head
is updated.

hisi_dma_irq updates cq_head only when the completion status is
success. When an abnormal interrupt reports, cq_head will not update
which will cause subsequent interrupt processes read the error CQ
and never report the correct status.

This patch updates cq_head whenever CQ is accessed.

Fixes: e9f08b6 ("dmaengine: hisilicon: Add Kunpeng DMA engine support")
Signed-off-by: Jie Hai <[email protected]>
Acked-by: Zhou Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Jie Hai

drivers/dma/hisi_dma.c

@@ -436,12 +436,10 @@ static irqreturn_t hisi_dma_irq(int irq, void *data)
 	desc = chan->desc;
 	cqe = chan->cq + chan->cq_head;
 	if (desc) {
+		chan->cq_head = (chan->cq_head + 1) % hdma_dev->chan_depth;
+		hisi_dma_chan_write(hdma_dev->base, HISI_DMA_CQ_HEAD_PTR,
+				    chan->qp_num, chan->cq_head);
 		if (FIELD_GET(STATUS_MASK, cqe->w0) == STATUS_SUCC) {
-			chan->cq_head = (chan->cq_head + 1) %
-					hdma_dev->chan_depth;
-			hisi_dma_chan_write(hdma_dev->base,
-					    HISI_DMA_CQ_HEAD_PTR, chan->qp_num,
-					    chan->cq_head);
 			vchan_cookie_complete(&desc->vd);
 		} else {
 			dev_err(&hdma_dev->pdev->dev, "task error!\n");