[PATCH] usb: gadget: udc: renesas_usb3: fix error return code in renesas_usb3_probe()

[PATCH] usb: gadget: udc: renesas_usb3: fix error return code in renesas_usb3_probe()

[Gustavo A. R. Silva]

platform_get_irq() returns an error code, but the renesas_usb3 driver
ignores it and always returns -ENODEV. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Also, notice that platform_get_irq() no longer returns 0 on error:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af

Print error message and propagate the return value of platform_get_irq
on failure.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/usb/gadget/udc/renesas_usb3.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index e1de8fe..616d053 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2468,8 +2468,10 @@ static int renesas_usb3_probe(struct platform_device *pdev)
 	priv = match->data;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return -ENODEV;
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
+		return irq;
+	}
 
 	usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
 	if (!usb3)
-- 
2.5.0

RE: [PATCH] usb: gadget: udc: renesas_usb3: fix error return code in renesas_usb3_probe()

[Yoshihiro Shimoda]

Hi Gustavo,

Thank you for the patch!

> -----Original Message-----
> From: Gustavo A. R. Silva
> Sent: Wednesday, August 9, 2017 7:35 AM
> 
> platform_get_irq() returns an error code, but the renesas_usb3 driver
> ignores it and always returns -ENODEV. This is not correct and,
> prevents -EPROBE_DEFER from being propagated properly.

Thank you for the point. I got it.

> Also, notice that platform_get_irq() no longer returns 0 on error:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92
> af

I don't think this explanation needs.
After this is removed,

Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Best regards,
Yoshihiro Shimoda

> Print error message and propagate the return value of platform_get_irq
> on failure.
> 
> This issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
>  drivers/usb/gadget/udc/renesas_usb3.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
> index e1de8fe..616d053 100644
> --- a/drivers/usb/gadget/udc/renesas_usb3.c
> +++ b/drivers/usb/gadget/udc/renesas_usb3.c
> @@ -2468,8 +2468,10 @@ static int renesas_usb3_probe(struct platform_device *pdev)
>  	priv = match->data;
> 
>  	irq = platform_get_irq(pdev, 0);
> -	if (irq < 0)
> -		return -ENODEV;
> +	if (irq < 0) {
> +		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
> +		return irq;
> +	}
> 
>  	usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
>  	if (!usb3)
> --
> 2.5.0
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH] usb: gadget: udc: renesas_usb3: fix error return code in renesas_usb3_probe()

[Gustavo A. R. Silva]

Hi Yoshihiro,

On 08/09/2017 06:44 AM, Yoshihiro Shimoda wrote:
> Hi Gustavo,
>
> Thank you for the patch!
>

I'm glad to help :)

>> -----Original Message-----
>> From: Gustavo A. R. Silva
>> Sent: Wednesday, August 9, 2017 7:35 AM
>>
>> platform_get_irq() returns an error code, but the renesas_usb3 driver
>> ignores it and always returns -ENODEV. This is not correct and,
>> prevents -EPROBE_DEFER from being propagated properly.
>
> Thank you for the point. I got it.
>
>> Also, notice that platform_get_irq() no longer returns 0 on error:
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92
>> af
>
> I don't think this explanation needs.
> After this is removed,
>
> Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
>

Thank you
--
Gustavo A. R. Silva

> Best regards,
> Yoshihiro Shimoda
>
>> Print error message and propagate the return value of platform_get_irq
>> on failure.
>>
>> This issue was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>>  drivers/usb/gadget/udc/renesas_usb3.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
>> index e1de8fe..616d053 100644
>> --- a/drivers/usb/gadget/udc/renesas_usb3.c
>> +++ b/drivers/usb/gadget/udc/renesas_usb3.c
>> @@ -2468,8 +2468,10 @@ static int renesas_usb3_probe(struct platform_device *pdev)
>>  	priv = match->data;
>>
>>  	irq = platform_get_irq(pdev, 0);
>> -	if (irq < 0)
>> -		return -ENODEV;
>> +	if (irq < 0) {
>> +		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
>> +		return irq;
>> +	}
>>
>>  	usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
>>  	if (!usb3)
>> --
>> 2.5.0
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html