linux-kernel - [PATCH 1/2] dmaengine: ti: edma: add missed pm_runtime

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Date:   Mon, 18 Nov 2019 15:37:28 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH 1/2] dmaengine: ti: edma: add missed pm_runtime_disable

The driver forgets to call pm_runtime_disable in probe failure and
remove.
Add the calls and modify probe failure handling to fix it.

Fixes: 2b6b3b742019 ("ARM/dmaengine: edma: Merge the two drivers under drivers/dma/")
Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
 drivers/dma/ti/edma.c | 43 ++++++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 15 deletions(-)

diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
index ba7c4f07fcd6..8be32fd9f762 100644
--- a/drivers/dma/ti/edma.c
+++ b/drivers/dma/ti/edma.c
@@ -2282,16 +2282,18 @@ static int edma_probe(struct platform_device *pdev)
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		dev_err(dev, "pm_runtime_get_sync() failed\n");
-		return ret;
+		goto err_disable_pm;
 	}
 
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
-	if (!ecc)
-		return -ENOMEM;
+	if (!ecc) {
+		ret = -ENOMEM;
+		goto err_disable_pm;
+	}
 
 	ecc->dev = dev;
 	ecc->id = pdev->id;
@@ -2306,30 +2308,37 @@ static int edma_probe(struct platform_device *pdev)
 		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		if (!mem) {
 			dev_err(dev, "no mem resource?\n");
-			return -ENODEV;
+			ret = -ENODEV;
+			goto err_disable_pm;
 		}
 	}
 	ecc->base = devm_ioremap_resource(dev, mem);
-	if (IS_ERR(ecc->base))
-		return PTR_ERR(ecc->base);
+	if (IS_ERR(ecc->base)) {
+		ret = PTR_ERR(ecc->base);
+		goto err_disable_pm;
+	}
 
 	platform_set_drvdata(pdev, ecc);
 
 	/* Get eDMA3 configuration from IP */
 	ret = edma_setup_from_hw(dev, info, ecc);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	/* Allocate memory based on the information we got from the IP */
 	ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
 					sizeof(*ecc->slave_chans), GFP_KERNEL);
-	if (!ecc->slave_chans)
-		return -ENOMEM;
+	if (!ecc->slave_chans) {
+		ret = -ENOMEM;
+		goto err_disable_pm;
+	}
 
 	ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
 				       sizeof(unsigned long), GFP_KERNEL);
-	if (!ecc->slot_inuse)
-		return -ENOMEM;
+	if (!ecc->slot_inuse) {
+		ret = -ENOMEM;
+		goto err_disable_pm;
+	}
 
 	ecc->default_queue = info->default_queue;
 
@@ -2368,7 +2377,7 @@ static int edma_probe(struct platform_device *pdev)
 				       ecc);
 		if (ret) {
 			dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
-			return ret;
+			goto err_disable_pm;
 		}
 		ecc->ccint = irq;
 	}
@@ -2384,7 +2393,7 @@ static int edma_probe(struct platform_device *pdev)
 				       ecc);
 		if (ret) {
 			dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
-			return ret;
+			goto err_disable_pm;
 		}
 		ecc->ccerrint = irq;
 	}
@@ -2392,7 +2401,8 @@ static int edma_probe(struct platform_device *pdev)
 	ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
 	if (ecc->dummy_slot < 0) {
 		dev_err(dev, "Can't allocate PaRAM dummy slot\n");
-		return ecc->dummy_slot;
+		ret = ecc->dummy_slot;
+		goto err_disable_pm;
 	}
 
 	queue_priority_mapping = info->queue_priority_mapping;
@@ -2473,6 +2483,8 @@ static int edma_probe(struct platform_device *pdev)
 
 err_reg1:
 	edma_free_slot(ecc, ecc->dummy_slot);
+err_disable_pm:
+	pm_runtime_disable(dev);
 	return ret;
 }
 
@@ -2503,6 +2515,7 @@ static int edma_remove(struct platform_device *pdev)
 	if (ecc->dma_memcpy)
 		dma_async_device_unregister(ecc->dma_memcpy);
 	edma_free_slot(ecc, ecc->dummy_slot);
+	pm_runtime_disable(dev);
 
 	return 0;
 }
-- 
2.24.0