linux-kernel - Re: [PATCH] rpmsg: virtio_rpmsg_bus: use dev_warn

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Date:   Tue, 28 Sep 2021 16:33:55 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Alexandru Ardelean <ardeleanalex@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ohad@...ery.com, mathieu.poirier@...aro.org
Subject: Re: [PATCH] rpmsg: virtio_rpmsg_bus: use dev_warn_ratelimited for
 msg with no recipient

On Tue 28 Sep 08:29 CDT 2021, Alexandru Ardelean wrote:

> From: Alexandru Ardelean <ardeleanalex@...il.com>
> 
> Even though it may be user-space's fault for this error (some application
> terminated or crashed without cleaning up it's endpoint), the rpmsg
> communication should not overflow the syslog with too many messages.
> 
> A dev_warn_ratelimited() seems like a good alternative in case this can
> occur.
> 

Is there anything a user could/should do when they see this entry in
their log?

It doesn't look very actionable to me, should we perhaps degrade it
further to just a dev_dbg()?

Regards,
Bjorn

> Signed-off-by: Alexandru Ardelean <ardeleanalex@...il.com>
> ---
>  drivers/rpmsg/virtio_rpmsg_bus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
> index 8e49a3bacfc7..546f0fb66f1d 100644
> --- a/drivers/rpmsg/virtio_rpmsg_bus.c
> +++ b/drivers/rpmsg/virtio_rpmsg_bus.c
> @@ -749,7 +749,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
>  		/* farewell, ept, we don't need you anymore */
>  		kref_put(&ept->refcount, __ept_release);
>  	} else
> -		dev_warn(dev, "msg received with no recipient\n");
> +		dev_warn_ratelimited(dev, "msg received with no recipient\n");
>  
>  	/* publish the real size of the buffer */
>  	rpmsg_sg_init(&sg, msg, vrp->buf_size);
> -- 
> 2.31.1
>