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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 57beb5c..ed2c949 100644 (file)
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -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;
 }
 

diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 50830be..f6d92d7 100644 (file)
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -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,
 };