target/linux/layerscape/patches-5.4/806-dma-0025-MLK-22909-dmaengine-fsl-edma-v3-clear-interrupt-comi.patch

   1 From 7021361c27946c60885b3f031ddde342f9a5432f Mon Sep 17 00:00:00 2001
   2 From: Robin Gong <yibin.gong@nxp.com>
   3 Date: Tue, 5 Nov 2019 21:32:22 +0800
   4 Subject: [PATCH] MLK-22909 dmaengine: fsl-edma-v3: clear interrupt coming
   5  after channel terminated
   6
   7 Clear EDMA_CH_INT in case dma done interrupt comes after channel terminated
   8 instead of channel free-ed, otherwise, RCU maybe caught because it's
   9 ignored without interrupt status cleared as Android team report in Monkey
  10 test.
  11
  12 Signed-off-by: Robin Gong <yibin.gong@nxp.com>
  13 Acked-by: Fugang Duan <fugang.duan@nxp.com>
  14 (cherry picked from commit ef91ff6ed465cebe2fe6483a480351abba36e237)
  15 (cherry picked from commit 56ee55c71c5f3ef254acb4dee581e68f79ef13a5)
  16 ---
  17  drivers/dma/fsl-edma-v3.c | 8 ++++++--
  18  1 file changed, 6 insertions(+), 2 deletions(-)
  19
  20 --- a/drivers/dma/fsl-edma-v3.c
  21 +++ b/drivers/dma/fsl-edma-v3.c
  22 @@ -710,8 +710,8 @@ static irqreturn_t fsl_edma3_tx_handler(
  23
  24         spin_lock(&fsl_chan->vchan.lock);
  25
  26 -       /* Ignore this interrupt since channel has been disabled already */
  27 -       if (!fsl_chan->edesc)
  28 +       /* Ignore this interrupt since channel has been freeed with power off */
  29 +       if (!fsl_chan->edesc && !fsl_chan->tcd_pool)
  30                 goto irq_handled;
  31
  32         base_addr = fsl_chan->membase;
  33 @@ -722,6 +722,10 @@ static irqreturn_t fsl_edma3_tx_handler(
  34
  35         writel(1, base_addr + EDMA_CH_INT);
  36
  37 +       /* Ignore this interrupt since channel has been disabled already */
  38 +       if (!fsl_chan->edesc)
  39 +               goto irq_handled;
  40 +
  41         if (!fsl_chan->edesc->iscyclic) {
  42                 fsl_edma3_get_realcnt(fsl_chan);
  43                 list_del(&fsl_chan->edesc->vdesc.node);