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

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Message-Id: <25402731580985618@sas2-1c82b59a1818.qloud-c.yandex.net>
Date:   Thu, 06 Feb 2020 13:40:18 +0300
From:   nikita.shubin@...uefel.me
To:     Nikita Shubin <nshubin@...con.com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: warn on kick missing

Sorry for malformed message, please ignore it.

06.02.2020, 08:53, "Nikita Shubin" <nshubin@...con.com>:
> .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.
>
> 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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