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dmaengine: xilinx: dpdma: Fix race condition in done IRQ

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The active descriptor pointer is accessed from different contexts,
including different interrupt handlers, and its access must be protected
by the channel's lock. This wasn't done in the done IRQ handler. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20210307040629.29308-3-laurent.pinchart@ideasonboard.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Laurent Pinchart 2021-03-07 06:06:29 +02:00 committed by Vinod Koul
parent 1cbd446662
commit 868833fbff
1 changed files with 2 additions and 1 deletions
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3
drivers/dma/xilinx/xilinx_dpdma.c
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@ -1048,13 +1048,14 @@ static int xilinx_dpdma_chan_stop(struct xilinx_dpdma_chan *chan)
*/
static void xilinx_dpdma_chan_done_irq(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_tx_desc *active = chan->desc.active;
struct xilinx_dpdma_tx_desc *active;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
xilinx_dpdma_debugfs_desc_done_irq(chan);
active = chan->desc.active;
if (active)
vchan_cyclic_callback(&active->vdesc);
else