linux-kernel - [PATCH 1/2] dma: imx-sdma: use module_platform

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Date:	Wed, 30 Jul 2014 18:41:14 +0530
From:	Vignesh Raman <Vignesh_Raman@...tor.com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>,
	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<Jiada_Wang@...tor.com>
Subject: [PATCH 1/2] dma: imx-sdma: use module_platform_driver for SDMA driver

Currently there is no module_exit declared in SDMA driver, so that once
sdma module is inserted, it's shown with permanent attribute by lsmod,
and it can't be removed.
Use module_platform_driver to register/unregister SDMA driver and modify
SDMA's remove operation, to make SDMA driver possible to be removed.

Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/dma/imx-sdma.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 14867e3..1360b9d 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1633,7 +1633,21 @@ err_irq:
 
 static int sdma_remove(struct platform_device *pdev)
 {
-	return -EBUSY;
+	struct sdma_engine *sdma = platform_get_drvdata(pdev);
+	struct resource *iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	int irq = platform_get_irq(pdev, 0);
+
+	dma_async_device_unregister(&sdma->dma_device);
+	kfree(sdma->script_addrs);
+	free_irq(irq, sdma);
+	iounmap(sdma->regs);
+	release_mem_region(iores->start, resource_size(iores));
+	kfree(sdma);
+
+	platform_set_drvdata(pdev, NULL);
+
+	dev_info(&pdev->dev, "Removed...\n");
+	return 0;
 }
 
 static struct platform_driver sdma_driver = {
-- 
1.7.9.5

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