linux-kernel - Re: [PATCH] remoteproc: warn on kick missing

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Message-ID: <20200206201827.GP2514@yoga>
Date:   Thu, 6 Feb 2020 12:18:27 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Nikita Shubin <NShubin@...con.com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remoteproc: warn on kick missing

On Wed 05 Feb 21:54 PST 2020, Nikita Shubin wrote:

> .kick method not set in rproc_ops will result in:
> 
> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference
> 
> in rproc_virtio_notify, after firmware loading.
> 
> At least a warning needed on attempt to call missing method.

Is this not a fatal error only happening during development? In which
case the NULL pointer dereference will come with an oops with sufficient
information to pinpoint what's going on?

Regards,
Bjorn

> 
> Signed-off-by: Nikita Shubin <NShubin@...con.com>
> ---
>  drivers/remoteproc/remoteproc_virtio.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 8c07cb2ca8ba..77a81f331e3f 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -32,6 +32,12 @@ static bool rproc_virtio_notify(struct virtqueue *vq)
> 
>         dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);
> 
> +       if (unlikely(rproc->ops->kick == NULL)) {
> +               WARN_ONCE(rproc->ops->kick == NULL, ".kick method not defined for %s",
> +                       rproc->name);
> +               return false;
> +       }
> +
>         rproc->ops->kick(rproc, notifyid);
>         return true;
>  }
> --
> 2.24.1
> 
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