[PATCH 0/3] media: bcm2835-unicam: Improve error handling during probe

[PATCH 0/3] media: bcm2835-unicam: Improve error handling during probe

[Ricardo Ribalda]

Improve the error handling of the irq errors. I am not sure why the
retcode was replaced always with -EINVAL, so I have added that fix as a
follow-up patch.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
Ricardo Ribalda (3):
      media: bcm2835-unicam: Fix error handling for platform_get_irq
      media: bcm2835-unicam: Do not print error when irq not found
      media: bcm2835-unicam: Do not replace IRQ retcode during probe

 drivers/media/platform/broadcom/bcm2835-unicam.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
---
base-commit: 1c73d0b29d04bf4082e7beb6a508895e118ee30d
change-id: 20240430-fix-broad-490eb1a39754

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>

[PATCH 1/3] media: bcm2835-unicam: Fix error handling for platform_get_irq

[Ricardo Ribalda]

platform_get_irq() cannot return the value 0.

If it returns -EPROBE_DEFER, we need to populate the error code upwards
to retry probing once the irq handler is ready.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/broadcom/bcm2835-unicam.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
index bd2bbb53070e..2a3a27ac70ba 100644
--- a/drivers/media/platform/broadcom/bcm2835-unicam.c
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -2660,9 +2660,10 @@ static int unicam_probe(struct platform_device *pdev)
 	}
 
 	ret = platform_get_irq(pdev, 0);
-	if (ret <= 0) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "No IRQ resource\n");
-		ret = -EINVAL;
+		if (ret != -EPROBE_DEFER)
+			ret = -EINVAL;
 		goto err_unicam_put;
 	}
 

-- 
2.44.0.769.g3c40516874-goog

Re: [PATCH 1/3] media: bcm2835-unicam: Fix error handling for platform_get_irq

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Tue, Apr 30, 2024 at 07:51:26AM +0000, Ricardo Ribalda wrote:
> platform_get_irq() cannot return the value 0.
> 
> If it returns -EPROBE_DEFER, we need to populate the error code upwards
> to retry probing once the irq handler is ready.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/platform/broadcom/bcm2835-unicam.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
> index bd2bbb53070e..2a3a27ac70ba 100644
> --- a/drivers/media/platform/broadcom/bcm2835-unicam.c
> +++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
> @@ -2660,9 +2660,10 @@ static int unicam_probe(struct platform_device *pdev)
>  	}
>  
>  	ret = platform_get_irq(pdev, 0);
> -	if (ret <= 0) {
> +	if (ret < 0) {
>  		dev_err(&pdev->dev, "No IRQ resource\n");
> -		ret = -EINVAL;
> +		if (ret != -EPROBE_DEFER)
> +			ret = -EINVAL;

What's wrong with leaving ret untouched ? I assume it was set to -EINVAL
to avoid returning success in case ret was 0. Now that the test has
changed, I think we can leave the value as-is.

>  		goto err_unicam_put;
>  	}
>  
> 

-- 
Regards,

Laurent Pinchart

[PATCH 2/3] media: bcm2835-unicam: Do not print error when irq not found

[Ricardo Ribalda]

platform_get_irq() already prints an error for us.

Fixes cocci:
drivers/media/platform/broadcom/bcm2835-unicam.c:2664:2-9: line 2664 is redundant because platform_get_irq() already prints an error

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/broadcom/bcm2835-unicam.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
index 2a3a27ac70ba..b2b23d24da19 100644
--- a/drivers/media/platform/broadcom/bcm2835-unicam.c
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -2661,7 +2661,6 @@ static int unicam_probe(struct platform_device *pdev)
 
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
 		if (ret != -EPROBE_DEFER)
 			ret = -EINVAL;
 		goto err_unicam_put;

-- 
2.44.0.769.g3c40516874-goog

Re: [PATCH 2/3] media: bcm2835-unicam: Do not print error when irq not found

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Tue, Apr 30, 2024 at 07:51:27AM +0000, Ricardo Ribalda wrote:
> platform_get_irq() already prints an error for us.
> 
> Fixes cocci:
> drivers/media/platform/broadcom/bcm2835-unicam.c:2664:2-9: line 2664 is redundant because platform_get_irq() already prints an error
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/media/platform/broadcom/bcm2835-unicam.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
> index 2a3a27ac70ba..b2b23d24da19 100644
> --- a/drivers/media/platform/broadcom/bcm2835-unicam.c
> +++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
> @@ -2661,7 +2661,6 @@ static int unicam_probe(struct platform_device *pdev)
>  
>  	ret = platform_get_irq(pdev, 0);
>  	if (ret < 0) {
> -		dev_err(&pdev->dev, "No IRQ resource\n");
>  		if (ret != -EPROBE_DEFER)
>  			ret = -EINVAL;
>  		goto err_unicam_put;

-- 
Regards,

Laurent Pinchart

[PATCH 3/3] media: bcm2835-unicam: Do not replace IRQ retcode during probe

[Ricardo Ribalda]

Use the error code generated by platform_get_irq() and
devm_request_irq() as the error code of probe().

It will give a more accurate reason of why it failed.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/broadcom/bcm2835-unicam.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
index b2b23d24da19..0b2729bf4a36 100644
--- a/drivers/media/platform/broadcom/bcm2835-unicam.c
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -2660,17 +2660,13 @@ static int unicam_probe(struct platform_device *pdev)
 	}
 
 	ret = platform_get_irq(pdev, 0);
-	if (ret < 0) {
-		if (ret != -EPROBE_DEFER)
-			ret = -EINVAL;
+	if (ret < 0)
 		goto err_unicam_put;
-	}
 
 	ret = devm_request_irq(&pdev->dev, ret, unicam_isr, 0,
 			       "unicam_capture0", unicam);
 	if (ret) {
 		dev_err(&pdev->dev, "Unable to request interrupt\n");
-		ret = -EINVAL;
 		goto err_unicam_put;
 	}
 

-- 
2.44.0.769.g3c40516874-goog

Re: [PATCH 3/3] media: bcm2835-unicam: Do not replace IRQ retcode during probe

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Tue, Apr 30, 2024 at 07:51:28AM +0000, Ricardo Ribalda wrote:
> Use the error code generated by platform_get_irq() and
> devm_request_irq() as the error code of probe().
> 
> It will give a more accurate reason of why it failed.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/platform/broadcom/bcm2835-unicam.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
> index b2b23d24da19..0b2729bf4a36 100644
> --- a/drivers/media/platform/broadcom/bcm2835-unicam.c
> +++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
> @@ -2660,17 +2660,13 @@ static int unicam_probe(struct platform_device *pdev)
>  	}
>  
>  	ret = platform_get_irq(pdev, 0);
> -	if (ret < 0) {
> -		if (ret != -EPROBE_DEFER)
> -			ret = -EINVAL;
> +	if (ret < 0)
>  		goto err_unicam_put;
> -	}

I think you can squash the whole patch with 1/3.

>  
>  	ret = devm_request_irq(&pdev->dev, ret, unicam_isr, 0,
>  			       "unicam_capture0", unicam);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Unable to request interrupt\n");
> -		ret = -EINVAL;
>  		goto err_unicam_put;
>  	}
>  

-- 
Regards,

Laurent Pinchart