Re: [PATCH v2 2/7] dmaengine: hisilicon: Fix CQ head update

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2022/7/21 21:27, Vinod Koul wrote:
On 29-06-22, 11:55, Jie Hai wrote:
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: e9f08b65250d ("dmaengine: hisilicon: Add Kunpeng DMA engine support")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Jie Hai <haijie1@xxxxxxxxxx>
---
  drivers/dma/hisi_dma.c | 10 +++++-----
  1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/hisi_dma.c b/drivers/dma/hisi_dma.c
index 98bc488893cc..7609e6e7eb37 100644
--- a/drivers/dma/hisi_dma.c
+++ b/drivers/dma/hisi_dma.c
@@ -436,12 +436,12 @@ 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;

This can look better with single line

Thanks for your reviewing.
These issues have been fixed in V3.
+		hisi_dma_chan_write(hdma_dev->base,
+				    HISI_DMA_CQ_HEAD_PTR, chan->qp_num,
+				    chan->cq_head);

maybe two lines?

  		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");
--
2.33.0




[Index of Archives]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux PCI]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux