linux-kernel - [PATCH V3 6/6] dmaengine: tegra-apb: Free interrupts before killing tasklets

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Date:	Fri, 13 Nov 2015 16:39:43 +0000
From:	Jon Hunter <jonathanh@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>
CC:	<dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <andy.shevchenko@...il.com>,
	Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH V3 6/6] dmaengine: tegra-apb: Free interrupts before killing tasklets

On probe failure or driver removal, before killing any tasklets, ensure
that the channel interrupt is freed to ensure that another channel
interrupt cannot occur and schedule the tasklet again.

Signed-off-by: Jon Hunter <jonathanh@...dia.com>
---
 drivers/dma/tegra20-apb-dma.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 754c1f54d4fe..935da8192f59 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1396,8 +1396,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
 		}
 		tdc->irq = res->start;
 		snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
-		ret = devm_request_irq(&pdev->dev, tdc->irq,
-				tegra_dma_isr, 0, tdc->name, tdc);
+		ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc);
 		if (ret) {
 			dev_err(&pdev->dev,
 				"request_irq failed with err %d channel %d\n",
@@ -1478,6 +1477,8 @@ err_unregister_dma_dev:
 err_irq:
 	while (--i >= 0) {
 		struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+		free_irq(tdc->irq, tdc);
 		tasklet_kill(&tdc->tasklet);
 	}
 
@@ -1497,6 +1498,7 @@ static int tegra_dma_remove(struct platform_device *pdev)
 
 	for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
 		tdc = &tdma->channels[i];
+		free_irq(tdc->irq, tdc);
 		tasklet_kill(&tdc->tasklet);
 	}
 
-- 
2.1.4

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