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    Subject[PATCH AUTOSEL 5.4 136/330] dmaengine: stm32-mdma: use vchan_terminate_vdesc() in .terminate_all
    Date
    From: Amelie Delaunay <amelie.delaunay@st.com>

    [ Upstream commit dfc708812a2acfc0ca56f56233b3c3e7b0d4ffe7 ]

    To avoid race with vchan_complete, use the race free way to terminate
    running transfer.

    Move vdesc->node list_del in stm32_mdma_start_transfer instead of in
    stm32_mdma_xfer_end to avoid another race in vchan_dma_desc_free_list.

    Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
    Link: https://lore.kernel.org/r/20200127085334.13163-7-amelie.delaunay@st.com
    Signed-off-by: Vinod Koul <vkoul@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/dma/stm32-mdma.c | 9 ++++++---
    1 file changed, 6 insertions(+), 3 deletions(-)

    diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
    index 5838311cf9900..ee1cbf3be75d5 100644
    --- a/drivers/dma/stm32-mdma.c
    +++ b/drivers/dma/stm32-mdma.c
    @@ -1127,6 +1127,8 @@ static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
    return;
    }

    + list_del(&vdesc->node);
    +
    chan->desc = to_stm32_mdma_desc(vdesc);
    hwdesc = chan->desc->node[0].hwdesc;
    chan->curr_hwdesc = 0;
    @@ -1242,8 +1244,10 @@ static int stm32_mdma_terminate_all(struct dma_chan *c)
    LIST_HEAD(head);

    spin_lock_irqsave(&chan->vchan.lock, flags);
    - if (chan->busy) {
    - stm32_mdma_stop(chan);
    + if (chan->desc) {
    + vchan_terminate_vdesc(&chan->desc->vdesc);
    + if (chan->busy)
    + stm32_mdma_stop(chan);
    chan->desc = NULL;
    }
    vchan_get_all_descriptors(&chan->vchan, &head);
    @@ -1331,7 +1335,6 @@ static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,

    static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
    {
    - list_del(&chan->desc->vdesc.node);
    vchan_cookie_complete(&chan->desc->vdesc);
    chan->desc = NULL;
    chan->busy = false;
    --
    2.25.1
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