On Fri, Oct 11, 2013 at 07:06:43PM +0530, Pekon Gupta wrote:
> "Managed Device Resource" or devm_xx calls takes care of automatic freeing
> of the resource in case of:
> - failure during driver probe
> - failure during resource allocation
> - detaching or unloading of driver module (rmmod)
> Reference: Documentation/driver-model/devres.txt
>
> Though OMAP NAND driver handles freeing of resource allocation in most of
> the cases, but using devm_xx provides more clean and effortless approach
> to handle all such cases.
>
> Signed-off-by: Pekon Gupta <pekon@xxxxxx>
Reviewed-by: Felipe Balbi <balbi@xxxxxx>
> ---
> drivers/mtd/nand/omap2.c | 38 +++++++++++++++++++++-----------------
> 1 file changed, 21 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index a783dae..0f2b0d1 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1658,7 +1658,8 @@ static int omap_nand_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - info = kzalloc(sizeof(struct omap_nand_info), GFP_KERNEL);
> + info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
> + GFP_KERNEL);
> if (!info)
> return -ENOMEM;
>
> @@ -1690,13 +1691,14 @@ static int omap_nand_probe(struct platform_device *pdev)
> info->phys_base = res->start;
> info->mem_size = resource_size(res);
>
> - if (!request_mem_region(info->phys_base, info->mem_size,
> - pdev->dev.driver->name)) {
> + if (!devm_request_mem_region(&pdev->dev, info->phys_base,
> + info->mem_size, pdev->dev.driver->name)) {
> err = -EBUSY;
> goto out_free_info;
> }
>
> - info->nand.IO_ADDR_R = ioremap(info->phys_base, info->mem_size);
> + info->nand.IO_ADDR_R = devm_ioremap(&pdev->dev, info->phys_base,
> + info->mem_size);
> if (!info->nand.IO_ADDR_R) {
> err = -ENOMEM;
> goto out_release_mem_region;
> @@ -1799,8 +1801,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> err = -ENODEV;
> goto out_release_mem_region;
> }
> - err = request_irq(info->gpmc_irq_fifo, omap_nand_irq,
> - IRQF_SHARED, "gpmc-nand-fifo", info);
> + err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo,
> + omap_nand_irq, IRQF_SHARED,
> + "gpmc-nand-fifo", info);
> if (err) {
> dev_err(&pdev->dev, "requesting irq(%d) error:%d",
> info->gpmc_irq_fifo, err);
> @@ -1814,8 +1817,9 @@ static int omap_nand_probe(struct platform_device *pdev)
> err = -ENODEV;
> goto out_release_mem_region;
> }
> - err = request_irq(info->gpmc_irq_count, omap_nand_irq,
> - IRQF_SHARED, "gpmc-nand-count", info);
> + err = devm_request_irq(&pdev->dev, info->gpmc_irq_count,
> + omap_nand_irq, IRQF_SHARED,
> + "gpmc-nand-count", info);
> if (err) {
> dev_err(&pdev->dev, "requesting irq(%d) error:%d",
> info->gpmc_irq_count, err);
> @@ -2031,10 +2035,10 @@ out_release_mem_region:
> if (info->dma)
> dma_release_channel(info->dma);
> if (info->gpmc_irq_count > 0)
> - free_irq(info->gpmc_irq_count, info);
> + devm_free_irq(&pdev->dev, info->gpmc_irq_count, info);
> if (info->gpmc_irq_fifo > 0)
> - free_irq(info->gpmc_irq_fifo, info);
> - release_mem_region(info->phys_base, info->mem_size);
> + devm_free_irq(&pdev->dev, info->gpmc_irq_fifo, info);
> + devm_release_mem_region(&pdev->dev, info->phys_base, info->mem_size);
> out_free_info:
> #ifdef CONFIG_MTD_NAND_ECC_BCH
> if (info->nand.ecc.priv) {
> @@ -2042,7 +2046,7 @@ out_free_info:
> info->nand.ecc.priv = NULL;
> }
> #endif
> - kfree(info);
> + devm_kfree(&pdev->dev, info);
>
> return err;
> }
> @@ -2062,15 +2066,15 @@ static int omap_nand_remove(struct platform_device *pdev)
> dma_release_channel(info->dma);
>
> if (info->gpmc_irq_count > 0)
> - free_irq(info->gpmc_irq_count, info);
> + devm_free_irq(&pdev->dev, info->gpmc_irq_count, info);
> if (info->gpmc_irq_fifo > 0)
> - free_irq(info->gpmc_irq_fifo, info);
> + devm_free_irq(&pdev->dev, info->gpmc_irq_fifo, info);
>
> /* Release NAND device, its internal structures and partitions */
> nand_release(&info->mtd);
> - iounmap(info->nand.IO_ADDR_R);
> - release_mem_region(info->phys_base, info->mem_size);
> - kfree(info);
> + devm_iounmap(&pdev->dev, info->nand.IO_ADDR_R);
> + devm_release_mem_region(&pdev->dev, info->phys_base, info->mem_size);
> + devm_kfree(&pdev->dev, info);
> return 0;
> }
>
> --
> 1.8.1
>
--
balbi
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