[PATCH 2/7] dmaengine: fsldma: drain channel tasklet during removal

[Jiale Yao]

The channel IRQ schedules a tasklet that accesses the channel descriptor
lists. Device removal frees the IRQs and then releases each channel
without draining tasklets that were already queued.

Kill each channel tasklet before unmapping and freeing the channel. The
removal path has already freed all controller or channel IRQs, so no
interrupt handler can queue the tasklet again.

Fixes: 173acc7ce853 ("dmaengine: add driver for Freescale MPC85xx DMA controller")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/dma/fsldma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 22d62d958abd..0e2f84862261 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1205,6 +1205,7 @@ static int fsl_dma_chan_probe(struct fsldma_device *fdev,
 
 static void fsl_dma_chan_remove(struct fsldma_chan *chan)
 {
+	tasklet_kill(&chan->tasklet);
 	irq_dispose_mapping(chan->irq);
 	list_del(&chan->common.device_node);
 	iounmap(chan->regs);
-- 
2.34.1