netdev - Re: [PATCH net-next v2] netlink: provide an ability to set default extack message

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Message-ID: <Y9a9bTU3edwDRW6N@corigine.com>
Date:   Sun, 29 Jan 2023 19:39:41 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        bridge@...ts.linux-foundation.org,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Nikolay Aleksandrov <razor@...ckwall.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH net-next v2] netlink: provide an ability to set default
 extack message

On Sun, Jan 29, 2023 at 06:51:37PM +0200, Leon Romanovsky wrote:
> In netdev common pattern, extack pointer is forwarded to the drivers
> to be filled with error message. However, the caller can easily
> overwrite the filled message.
> 
> Instead of adding multiple "if (!extack->_msg)" checks before any
> NL_SET_ERR_MSG() call, which appears after call to the driver, let's
> add new macro to common code.
> 
> [1] https://lore.kernel.org/all/Y9Irgrgf3uxOjwUm@unreal
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>