[PATCH 3/7] dmaengine: mmp_pdma: drain channel tasklets during removal

[Jiale Yao <yaojiale02@163.com>]

PDMA interrupt handlers schedule per-channel tasklets that process
descriptor lists, invoke callbacks and return descriptors to their
pools. Freeing the IRQs does not drain tasklets that were already queued.

After freeing all controller or channel IRQs, kill every channel tasklet
before unregistering the DMA device and releasing its managed state.

Fixes: c8acd6aa6bed ("dmaengine: mmp-pdma support")
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/dma/mmp_pdma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index ed520737882b..a371f017fc3e 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -1119,6 +1119,7 @@ static void dma_do_tasklet(struct tasklet_struct *t)
 static void mmp_pdma_remove(struct platform_device *op)
 {
 	struct mmp_pdma_device *pdev = platform_get_drvdata(op);
+	struct mmp_pdma_chan *chan;
 	struct mmp_pdma_phy *phy;
 	int i, irq = 0, irq_num = 0;
 
@@ -1141,6 +1142,9 @@ static void mmp_pdma_remove(struct platform_device *op)
 		}
 	}
 
+	list_for_each_entry(chan, &pdev->device.channels, chan.device_node)
+		tasklet_kill(&chan->tasklet);
+
 	dma_async_device_unregister(&pdev->device);
 }
 
-- 
2.34.1