[PATCH v2 24/64] dmaengine: txx9dmac: route callbacks via channel BH

[Allen Pais]

Use the per-channel BH helpers for descriptor completion handling and
schedule per-channel work from both channel and controller IRQ paths.

Signed-off-by: Allen Pais <allen.lkml@xxxxxxxxx>
---
 drivers/dma/txx9dmac.c | 12 ++++++------
 drivers/dma/txx9dmac.h |  1 -
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c
index 05622b68a936..6269baa28c51 100644
--- a/drivers/dma/txx9dmac.c
+++ b/drivers/dma/txx9dmac.c
@@ -601,13 +601,13 @@ static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc)
 	}
 }
 
-static void txx9dmac_chan_tasklet(struct tasklet_struct *t)
+static void txx9dmac_chan_tasklet(struct dma_chan *chan)
 {
 	int irq;
 	u32 csr;
 	struct txx9dmac_chan *dc;
 
-	dc = from_tasklet(dc, t, tasklet);
+	dc = container_of(chan, struct txx9dmac_chan, chan);
 	csr = channel_readl(dc, CSR);
 	dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr);
 
@@ -628,7 +628,7 @@ static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id)
 	dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n",
 			channel_readl(dc, CSR));
 
-	tasklet_schedule(&dc->tasklet);
+	dma_chan_schedule_bh(&dc->chan);
 	/*
 	 * Just disable the interrupts. We'll turn them back on in the
 	 * softirq handler.
@@ -659,7 +659,7 @@ static void txx9dmac_tasklet(struct tasklet_struct *t)
 			spin_lock(&dc->lock);
 			if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
 				   TXX9_DMA_CSR_NTRNFC))
-				txx9dmac_scan_descriptors(dc);
+				dma_chan_schedule_bh(&dc->chan);
 			spin_unlock(&dc->lock);
 		}
 	}
@@ -1113,7 +1113,7 @@ static int __init txx9dmac_chan_probe(struct platform_device *pdev)
 		irq = platform_get_irq(pdev, 0);
 		if (irq < 0)
 			return irq;
-		tasklet_setup(&dc->tasklet, txx9dmac_chan_tasklet);
+		dma_chan_init_bh(&dc->chan, txx9dmac_chan_tasklet);
 		dc->irq = irq;
 		err = devm_request_irq(&pdev->dev, dc->irq,
 			txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc);
@@ -1159,7 +1159,7 @@ static void txx9dmac_chan_remove(struct platform_device *pdev)
 	dma_async_device_unregister(&dc->dma);
 	if (dc->irq >= 0) {
 		devm_free_irq(&pdev->dev, dc->irq, dc);
-		tasklet_kill(&dc->tasklet);
+		dma_chan_kill_bh(&dc->chan);
 	}
 	dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL;
 }
diff --git a/drivers/dma/txx9dmac.h b/drivers/dma/txx9dmac.h
index aa53eafb1519..f2abedb73d49 100644
--- a/drivers/dma/txx9dmac.h
+++ b/drivers/dma/txx9dmac.h
@@ -162,7 +162,6 @@ struct txx9dmac_chan {
 	struct dma_device	dma;
 	struct txx9dmac_dev	*ddev;
 	void __iomem		*ch_regs;
-	struct tasklet_struct	tasklet;
 	int			irq;
 	u32			ccr;
 
-- 
2.43.0