"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>
---
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
--
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