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Commit dbde5c29 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dw_dmac: use devm_* functions to simplify code 



Use devm_kzalloc, devm_clk_get, devm_request_irq, and devm_request_and_ioremap
to reduce the code and to simplify the error path.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent 63433250

drivers/dma/dw_dmac.c

+10 −43
Original line number Diff line number Diff line
@@ -1392,26 +1392,17 @@ static int __devinit dw_probe(struct platform_device *pdev) 


	size = sizeof(struct dw_dma);

	size += pdata->nr_channels * sizeof(struct dw_dma_chan);

	dw = kzalloc(size, GFP_KERNEL);

	dw = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);

	if (!dw)

		return -ENOMEM;



	if (!request_mem_region(io->start, DW_REGLEN, pdev->dev.driver->name)) {

		err = -EBUSY;

		goto err_kfree;

	}



	dw->regs = ioremap(io->start, DW_REGLEN);

	if (!dw->regs) {

		err = -ENOMEM;

		goto err_release_r;

	}

	dw->regs = devm_request_and_ioremap(&pdev->dev, io);

	if (!dw->regs)

		return -EBUSY;



	dw->clk = clk_get(&pdev->dev, "hclk");

	if (IS_ERR(dw->clk)) {

		err = PTR_ERR(dw->clk);

		goto err_clk;

	}

	dw->clk = devm_clk_get(&pdev->dev, "hclk");

	if (IS_ERR(dw->clk))

		return PTR_ERR(dw->clk);

	clk_prepare_enable(dw->clk);



	/* Calculate all channel mask before DMA setup */
@@ -1423,9 +1414,10 @@ static int __devinit dw_probe(struct platform_device *pdev) 
	/* disable BLOCK interrupts as well */

	channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);



	err = request_irq(irq, dw_dma_interrupt, 0, "dw_dmac", dw);

	err = devm_request_irq(&pdev->dev, irq, dw_dma_interrupt, 0,

			       "dw_dmac", dw);

	if (err)

		goto err_irq;

		return err;



	platform_set_drvdata(pdev, dw);
@@ -1491,30 +1483,16 @@ static int __devinit dw_probe(struct platform_device *pdev) 
	dma_async_device_register(&dw->dma);



	return 0;



err_irq:

	clk_disable_unprepare(dw->clk);

	clk_put(dw->clk);

err_clk:

	iounmap(dw->regs);

	dw->regs = NULL;

err_release_r:

	release_resource(io);

err_kfree:

	kfree(dw);

	return err;

}



static int __devexit dw_remove(struct platform_device *pdev)

{

	struct dw_dma		*dw = platform_get_drvdata(pdev);

	struct dw_dma_chan	*dwc, *_dwc;

	struct resource		*io;



	dw_dma_off(dw);

	dma_async_device_unregister(&dw->dma);



	free_irq(platform_get_irq(pdev, 0), dw);

	tasklet_kill(&dw->tasklet);



	list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels,
@@ -1523,17 +1501,6 @@ static int __devexit dw_remove(struct platform_device *pdev) 
		channel_clear_bit(dw, CH_EN, dwc->mask);

	}



	clk_disable_unprepare(dw->clk);

	clk_put(dw->clk);



	iounmap(dw->regs);

	dw->regs = NULL;



	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	release_mem_region(io->start, DW_REGLEN);



	kfree(dw);



	return 0;

}

drivers/dma/dw_dmac_regs.h

+0 −2
Original line number Diff line number Diff line
@@ -140,8 +140,6 @@ struct dw_dma_regs { 
/* Bitfields in CFG */

#define DW_CFG_DMA_EN		(1 << 0)



#define DW_REGLEN		0x400



enum dw_dmac_flags {

	DW_DMA_IS_CYCLIC = 0,

};