Re: [PATCH-for-8.2 v2] backends/cryptodev: Do not ignore throttle/backends Errors

[Markus Armbruster <armbru@redhat.com>]

Philippe Mathieu-Daudé <philmd@linaro.org> writes:

> Both cryptodev_backend_set_throttle() and CryptoDevBackendClass::init()
> can set their Error** argument. Do not ignore them, return early on
> failure.

Let's mention why we need to: "Without that, running into another
failure trips error_setv()'s assertion."

>          Use the ERRP_GUARD() macro as suggested in commit ae7c80a7bd
> ("error: New macro ERRP_GUARD()").
>
> Cc: qemu-stable@nongnu.org
> Fixes: e7a775fd9f ("cryptodev: Account statistics")
> Fixes: 2580b452ff ("cryptodev: support QoS")
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  backends/cryptodev.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/backends/cryptodev.c b/backends/cryptodev.c
> index e5006bd215..fff89fd62a 100644
> --- a/backends/cryptodev.c
> +++ b/backends/cryptodev.c
> @@ -398,6 +398,7 @@ static void cryptodev_backend_set_ops(Object *obj, Visitor *v,
>  static void
>  cryptodev_backend_complete(UserCreatable *uc, Error **errp)
>  {
> +    ERRP_GUARD();
>      CryptoDevBackend *backend = CRYPTODEV_BACKEND(uc);
>      CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_GET_CLASS(uc);
>      uint32_t services;
> @@ -406,11 +407,20 @@ cryptodev_backend_complete(UserCreatable *uc, Error **errp)
>      QTAILQ_INIT(&backend->opinfos);
>      value = backend->tc.buckets[THROTTLE_OPS_TOTAL].avg;
>      cryptodev_backend_set_throttle(backend, THROTTLE_OPS_TOTAL, value, errp);
> +    if (*errp) {
> +        return;
> +    }
>      value = backend->tc.buckets[THROTTLE_BPS_TOTAL].avg;
>      cryptodev_backend_set_throttle(backend, THROTTLE_BPS_TOTAL, value, errp);
> +    if (*errp) {
> +        return;
> +    }
>  
>      if (bc->init) {
>          bc->init(backend, errp);
> +        if (*errp) {
> +            return;
> +        }
>      }
>  
>      services = backend->conf.crypto_services;

Preferably with the commit message improved:
Reviewed-by: Markus Armbruster <armbru@redhat.com>