diff mbox

[v9,9/9] mtd: nand: omap: updated devm_xx for all resource allocation and free calls

Message ID 1381816197-20477-10-git-send-email-pekon@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

pekon gupta Oct. 15, 2013, 5:49 a.m. UTC 
"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@ti.com>
---
 drivers/mtd/nand/omap2.c | 44 ++++++++++++++------------------------------
 1 file changed, 14 insertions(+), 30 deletions(-)

Comments

Brian Norris Oct. 17, 2013, 2:29 a.m. UTC | #1 
On Tue, Oct 15, 2013 at 11:19:57AM +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@ti.com>
> ---
>  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

[...]

> @@ -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:

Now that you've simplified this error path, you don't need so verbose of
a name (it could just be 'out'), but that's not worth another revision.

>  	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;
>  }

[...]

This patch version looks much better. Thanks for the rewrite.

Brian
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diff mbox

Patch

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;
 }