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OpenCloudOS-Kernel
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dmaengine: stm32-dma: use vchan_terminate_vdesc() in .terminate_all 

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

Move vdesc->node list_del in stm32_dma_start_transfer instead of in
stm32_mdma_chan_complete 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/20200129153628.29329-9-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amelie Delaunay 2020-01-29 16:36:28 +01:00 committed by Vinod Koul
parent 409ffc4d99
commit d80cbef35b
1 changed files with 6 additions and 3 deletions
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9
drivers/dma/stm32-dma.c
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@ -478,8 +478,10 @@ static int stm32_dma_terminate_all(struct dma_chan *c)
spin_lock_irqsave(&chan->vchan.lock, flags);
if (chan->busy) {
stm32_dma_stop(chan);
if (chan->desc) {
vchan_terminate_vdesc(&chan->desc->vdesc);
if (chan->busy)
stm32_dma_stop(chan);
chan->desc = NULL;
}
@ -535,6 +537,8 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
if (!vdesc)
return;
list_del(&vdesc->node);
chan->desc = to_stm32_dma_desc(vdesc);
chan->next_sg = 0;
}
@ -613,7 +617,6 @@ static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan)
} else {
chan->busy = false;
if (chan->next_sg == chan->desc->num_sgs) {
list_del(&chan->desc->vdesc.node);
vchan_cookie_complete(&chan->desc->vdesc);
chan->desc = NULL;
}