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@xxxxxxxxxx>
> ---
> 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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