"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 <[email protected]> --- drivers/mtd/nand/omap2.c | 44 ++++++++++++++------------------------------ 1 file changed, 14 insertions(+), 30 deletions(-) diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index 769ff65..0ed0d6f 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -1642,7 +1642,8 @@ 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; @@ -1667,19 +1668,20 @@ static int omap_nand_probe(struct platform_device *pdev) if (res == NULL) { err = -EINVAL; dev_err(&pdev->dev, "error getting memory resource\n"); - goto out_free_info; + goto out_release_mem_region; } 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; + goto out_release_mem_region; } - nand_chip->IO_ADDR_R = ioremap(info->phys_base, info->mem_size); + nand_chip->IO_ADDR_R = devm_ioremap(&pdev->dev, info->phys_base, + info->mem_size); if (!nand_chip->IO_ADDR_R) { err = -ENOMEM; goto out_release_mem_region; @@ -1781,8 +1783,9 @@ 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); @@ -1796,8 +1799,9 @@ 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); @@ -2010,45 +2014,25 @@ static int omap_nand_probe(struct platform_device *pdev) 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); - if (info->gpmc_irq_fifo > 0) - free_irq(info->gpmc_irq_fifo, info); - release_mem_region(info->phys_base, info->mem_size); -out_free_info: if (info->nand.ecc.priv) { nand_bch_free(info->nand.ecc.priv); info->nand.ecc.priv = NULL; } - kfree(info); - return err; } static int omap_nand_remove(struct platform_device *pdev) { struct mtd_info *mtd = platform_get_drvdata(pdev); - struct nand_chip *nand_chip = mtd->priv; struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, mtd); if (info->nand.ecc.priv) { nand_bch_free(info->nand.ecc.priv); info->nand.ecc.priv = NULL; } - if (info->dma) dma_release_channel(info->dma); - - if (info->gpmc_irq_count > 0) - free_irq(info->gpmc_irq_count, info); - if (info->gpmc_irq_fifo > 0) - free_irq(info->gpmc_irq_fifo, info); - - /* Release NAND device, its internal structures and partitions */ nand_release(mtd); - iounmap(nand_chip->IO_ADDR_R); - release_mem_region(info->phys_base, info->mem_size); - kfree(info); return 0; } -- 1.8.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
