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* [PATCH 2/6] mtd: oxnas_nand: Handle clk_prepare_enable/clk_disable_unprepare.
@ 2017-08-01 11:37 ` Arvind Yadav
  0 siblings, 0 replies; 4+ messages in thread
From: Arvind Yadav @ 2017-08-01 11:37 UTC (permalink / raw)
  To: boris.brezillon, richard, dwmw2, computersforpeace, marek.vasut,
	cyrille.pitchen, narmstrong
  Cc: linux-mtd, linux-kernel, linux-arm-kernel, linux-oxnas

 - clk_prepare_enable() can fail here and we must check its return value.
 - oxnas_nand_probe() can fail here and we must disable clock.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/mtd/nand/oxnas_nand.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/oxnas_nand.c b/drivers/mtd/nand/oxnas_nand.c
index 1b207aa..7061bb2 100644
--- a/drivers/mtd/nand/oxnas_nand.c
+++ b/drivers/mtd/nand/oxnas_nand.c
@@ -112,14 +112,19 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 	if (count > 1)
 		return -EINVAL;
 
-	clk_prepare_enable(oxnas->clk);
+	err = clk_prepare_enable(oxnas->clk);
+	if (err)
+		return err;
+
 	device_reset_optional(&pdev->dev);
 
 	for_each_child_of_node(np, nand_np) {
 		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
 				    GFP_KERNEL);
-		if (!chip)
-			return -ENOMEM;
+		if (!chip) {
+			err = -ENOMEM;
+			goto err_clk_unprepare;
+		}
 
 		chip->controller = &oxnas->base;
 
@@ -139,12 +144,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 		/* Scan to find existence of the device */
 		err = nand_scan(mtd, 1);
 		if (err)
-			return err;
+			goto err_clk_unprepare;
 
 		err = mtd_device_register(mtd, NULL, 0);
 		if (err) {
 			nand_release(mtd);
-			return err;
+			goto err_clk_unprepare;
 		}
 
 		oxnas->chips[nchips] = chip;
@@ -152,12 +157,18 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Exit if no chips found */
-	if (!nchips)
-		return -ENODEV;
+	if (!nchips) {
+		err = -ENODEV;
+		goto err_clk_unprepare;
+	}
 
 	platform_set_drvdata(pdev, oxnas);
 
 	return 0;
+
+err_clk_unprepare:
+	clk_disable_unprepare(oxnas->clk);
+	return err;
 }
 
 static int oxnas_nand_remove(struct platform_device *pdev)
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [PATCH 2/6] mtd: oxnas_nand: Handle clk_prepare_enable/clk_disable_unprepare.
@ 2017-08-01 11:37 ` Arvind Yadav
  0 siblings, 0 replies; 4+ messages in thread
From: Arvind Yadav @ 2017-08-01 11:37 UTC (permalink / raw)
  To: linux-arm-kernel

 - clk_prepare_enable() can fail here and we must check its return value.
 - oxnas_nand_probe() can fail here and we must disable clock.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/mtd/nand/oxnas_nand.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/oxnas_nand.c b/drivers/mtd/nand/oxnas_nand.c
index 1b207aa..7061bb2 100644
--- a/drivers/mtd/nand/oxnas_nand.c
+++ b/drivers/mtd/nand/oxnas_nand.c
@@ -112,14 +112,19 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 	if (count > 1)
 		return -EINVAL;
 
-	clk_prepare_enable(oxnas->clk);
+	err = clk_prepare_enable(oxnas->clk);
+	if (err)
+		return err;
+
 	device_reset_optional(&pdev->dev);
 
 	for_each_child_of_node(np, nand_np) {
 		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
 				    GFP_KERNEL);
-		if (!chip)
-			return -ENOMEM;
+		if (!chip) {
+			err = -ENOMEM;
+			goto err_clk_unprepare;
+		}
 
 		chip->controller = &oxnas->base;
 
@@ -139,12 +144,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 		/* Scan to find existence of the device */
 		err = nand_scan(mtd, 1);
 		if (err)
-			return err;
+			goto err_clk_unprepare;
 
 		err = mtd_device_register(mtd, NULL, 0);
 		if (err) {
 			nand_release(mtd);
-			return err;
+			goto err_clk_unprepare;
 		}
 
 		oxnas->chips[nchips] = chip;
@@ -152,12 +157,18 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Exit if no chips found */
-	if (!nchips)
-		return -ENODEV;
+	if (!nchips) {
+		err = -ENODEV;
+		goto err_clk_unprepare;
+	}
 
 	platform_set_drvdata(pdev, oxnas);
 
 	return 0;
+
+err_clk_unprepare:
+	clk_disable_unprepare(oxnas->clk);
+	return err;
 }
 
 static int oxnas_nand_remove(struct platform_device *pdev)
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH 2/6] mtd: oxnas_nand: Handle clk_prepare_enable/clk_disable_unprepare.
  2017-08-01 11:37 ` Arvind Yadav
@ 2017-08-01 11:49   ` Neil Armstrong
  -1 siblings, 0 replies; 4+ messages in thread
From: Neil Armstrong @ 2017-08-01 11:49 UTC (permalink / raw)
  To: Arvind Yadav, boris.brezillon, richard, dwmw2, computersforpeace,
	marek.vasut, cyrille.pitchen
  Cc: linux-mtd, linux-kernel, linux-arm-kernel, linux-oxnas

On 08/01/2017 01:37 PM, Arvind Yadav wrote:
>  - clk_prepare_enable() can fail here and we must check its return value.
>  - oxnas_nand_probe() can fail here and we must disable clock.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
> ---
>  drivers/mtd/nand/oxnas_nand.c | 25 ++++++++++++++++++-------
>  1 file changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/mtd/nand/oxnas_nand.c b/drivers/mtd/nand/oxnas_nand.c
> index 1b207aa..7061bb2 100644
> --- a/drivers/mtd/nand/oxnas_nand.c
> +++ b/drivers/mtd/nand/oxnas_nand.c
> @@ -112,14 +112,19 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  	if (count > 1)
>  		return -EINVAL;
>  
> -	clk_prepare_enable(oxnas->clk);
> +	err = clk_prepare_enable(oxnas->clk);
> +	if (err)
> +		return err;
> +
>  	device_reset_optional(&pdev->dev);
>  
>  	for_each_child_of_node(np, nand_np) {
>  		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
>  				    GFP_KERNEL);
> -		if (!chip)
> -			return -ENOMEM;
> +		if (!chip) {
> +			err = -ENOMEM;
> +			goto err_clk_unprepare;
> +		}
>  
>  		chip->controller = &oxnas->base;
>  
> @@ -139,12 +144,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  		/* Scan to find existence of the device */
>  		err = nand_scan(mtd, 1);
>  		if (err)
> -			return err;
> +			goto err_clk_unprepare;
>  
>  		err = mtd_device_register(mtd, NULL, 0);
>  		if (err) {
>  			nand_release(mtd);
> -			return err;
> +			goto err_clk_unprepare;
>  		}
>  
>  		oxnas->chips[nchips] = chip;
> @@ -152,12 +157,18 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Exit if no chips found */
> -	if (!nchips)
> -		return -ENODEV;
> +	if (!nchips) {
> +		err = -ENODEV;
> +		goto err_clk_unprepare;
> +	}
>  
>  	platform_set_drvdata(pdev, oxnas);
>  
>  	return 0;
> +
> +err_clk_unprepare:
> +	clk_disable_unprepare(oxnas->clk);
> +	return err;
>  }
>  
>  static int oxnas_nand_remove(struct platform_device *pdev)
> 

Indeed, Thanks,
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

^ permalink raw reply	[flat|nested] 4+ messages in thread
* [PATCH 2/6] mtd: oxnas_nand: Handle clk_prepare_enable/clk_disable_unprepare.
@ 2017-08-01 11:49   ` Neil Armstrong
  0 siblings, 0 replies; 4+ messages in thread
From: Neil Armstrong @ 2017-08-01 11:49 UTC (permalink / raw)
  To: linux-arm-kernel

On 08/01/2017 01:37 PM, Arvind Yadav wrote:
>  - clk_prepare_enable() can fail here and we must check its return value.
>  - oxnas_nand_probe() can fail here and we must disable clock.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
> ---
>  drivers/mtd/nand/oxnas_nand.c | 25 ++++++++++++++++++-------
>  1 file changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/mtd/nand/oxnas_nand.c b/drivers/mtd/nand/oxnas_nand.c
> index 1b207aa..7061bb2 100644
> --- a/drivers/mtd/nand/oxnas_nand.c
> +++ b/drivers/mtd/nand/oxnas_nand.c
> @@ -112,14 +112,19 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  	if (count > 1)
>  		return -EINVAL;
>  
> -	clk_prepare_enable(oxnas->clk);
> +	err = clk_prepare_enable(oxnas->clk);
> +	if (err)
> +		return err;
> +
>  	device_reset_optional(&pdev->dev);
>  
>  	for_each_child_of_node(np, nand_np) {
>  		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
>  				    GFP_KERNEL);
> -		if (!chip)
> -			return -ENOMEM;
> +		if (!chip) {
> +			err = -ENOMEM;
> +			goto err_clk_unprepare;
> +		}
>  
>  		chip->controller = &oxnas->base;
>  
> @@ -139,12 +144,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  		/* Scan to find existence of the device */
>  		err = nand_scan(mtd, 1);
>  		if (err)
> -			return err;
> +			goto err_clk_unprepare;
>  
>  		err = mtd_device_register(mtd, NULL, 0);
>  		if (err) {
>  			nand_release(mtd);
> -			return err;
> +			goto err_clk_unprepare;
>  		}
>  
>  		oxnas->chips[nchips] = chip;
> @@ -152,12 +157,18 @@ static int oxnas_nand_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Exit if no chips found */
> -	if (!nchips)
> -		return -ENODEV;
> +	if (!nchips) {
> +		err = -ENODEV;
> +		goto err_clk_unprepare;
> +	}
>  
>  	platform_set_drvdata(pdev, oxnas);
>  
>  	return 0;
> +
> +err_clk_unprepare:
> +	clk_disable_unprepare(oxnas->clk);
> +	return err;
>  }
>  
>  static int oxnas_nand_remove(struct platform_device *pdev)
> 

Indeed, Thanks,
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-08-01 11:49 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2017-08-01 11:37 [PATCH 2/6] mtd: oxnas_nand: Handle clk_prepare_enable/clk_disable_unprepare Arvind Yadav
2017-08-01 11:37 ` Arvind Yadav
2017-08-01 11:49 ` Neil Armstrong
2017-08-01 11:49   ` Neil Armstrong

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