[PATCH] virtio-mmio: Delete an error message in vm_find_vqs()

[PATCH] virtio-mmio: Delete an error message in vm_find_vqs()

[Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sun, 5 Apr 2020 19:14:10 +0200

The function “platform_get_irq” can log an error already.
Thus omit a redundant message for the exception handling in the
calling function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/virtio/virtio_mmio.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 97d5725fd9a2..9d16aaffca9d 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -466,10 +466,8 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	int irq = platform_get_irq(vm_dev->pdev, 0);
 	int i, err, queue_idx = 0;

-	if (irq < 0) {
-		dev_err(&vdev->dev, "Cannot get IRQ resource\n");
+	if (irq < 0)
 		return irq;
-	}

 	err = request_irq(irq, vm_interrupt, IRQF_SHARED,
 			dev_name(&vdev->dev), vm_dev);
--
2.26.0

Re: [PATCH] virtio-mmio: Delete an error message in vm_find_vqs()

[Jason Wang]

On 2020/4/6 上午1:19, Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Sun, 5 Apr 2020 19:14:10 +0200
>
> The function “platform_get_irq” can log an error already.
> Thus omit a redundant message for the exception handling in the
> calling function.


It looks to me that not all error path of platform_get_irq() were loggd.

And git grep told me there're other users of platform_get_irq() that 
check and log by themselves.

Thanks


>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>   drivers/virtio/virtio_mmio.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 97d5725fd9a2..9d16aaffca9d 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -466,10 +466,8 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>   	int irq = platform_get_irq(vm_dev->pdev, 0);
>   	int i, err, queue_idx = 0;
>
> -	if (irq < 0) {
> -		dev_err(&vdev->dev, "Cannot get IRQ resource\n");
> +	if (irq < 0)
>   		return irq;
> -	}
>
>   	err = request_irq(irq, vm_interrupt, IRQF_SHARED,
>   			dev_name(&vdev->dev), vm_dev);
> --
> 2.26.0
>

Re: virtio-mmio: Delete an error message in vm_find_vqs()

[Markus Elfring]

>> The function “platform_get_irq” can log an error already.
>> Thus omit a redundant message for the exception handling in the
>> calling function.
>
> It looks to me that not all error path of platform_get_irq() were loggd.

How do you think about to clarify the handling of the error code “-EPROBE_DEFER” any more?
https://elixir.bootlin.com/linux/v5.6.3/source/drivers/base/platform.c#L202


> And git grep told me there're other users of platform_get_irq() that check and log by themselves.

Source code analysis can point further update candidates out, can't it?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/base/platform.c?id=7723f4c5ecdb8d832f049f8483beb0d1081cedf6

Would you like to achieve collateral evolution?

Regards,
Markus

Re: virtio-mmio: Delete an error message in vm_find_vqs()

[Jason Wang]

On 2020/4/9 下午2:02, Markus Elfring wrote:
>>> The function “platform_get_irq” can log an error already.
>>> Thus omit a redundant message for the exception handling in the
>>> calling function.
>> It looks to me that not all error path of platform_get_irq() were loggd.
> How do you think about to clarify the handling of the error code “-EPROBE_DEFER” any more?
> https://elixir.bootlin.com/linux/v5.6.3/source/drivers/base/platform.c#L202


Aha, it looks to me that I'm on the wrong branch. Sorry.


>
>
>> And git grep told me there're other users of platform_get_irq() that check and log by themselves.
> Source code analysis can point further update candidates out, can't it?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/base/platform.c?id=7723f4c5ecdb8d832f049f8483beb0d1081cedf6


Yes, it can.


>
> Would you like to achieve collateral evolution?


Yes and it's probably be better to put all the fixes in one series.

For this patch.

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks


>
> Regards,
> Markus
>