linux-kernel - Re: [PATCH] vsock: ratelimit unknown ioctl error message

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Date:   Fri, 23 Oct 2020 16:09:47 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vsock: ratelimit unknown ioctl error message

On Fri, Oct 23, 2020 at 01:21:13PM +0100, Colin King wrote:
>From: Colin Ian King <colin.king@...onical.com>
>
>When exercising the kernel with stress-ng with some ioctl tests the
>"Unknown ioctl" error message is spamming the kernel log at a high
>rate. Rate limit this message to reduce the noise.
>
>Signed-off-by: Colin Ian King <colin.king@...onical.com>
>---
> net/vmw_vsock/af_vsock.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 9e93bc201cc0..b8feb9223454 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -2072,7 +2072,7 @@ static long vsock_dev_do_ioctl(struct file *filp,
> 		break;
>
> 	default:
>-		pr_err("Unknown ioctl %d\n", cmd);
>+		pr_err_ratelimited("Unknown ioctl %d\n", cmd);

Make sense, or maybe can we remove the error message returning only the
-EINVAL?

Both cases are fine for me:
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

> 		retval = -EINVAL;
> 	}
>
>-- 
>2.27.0
>