linux-kernel - Re: [PATCH net-next RFC v4 01/15] devlink: Add reload action option to devlink reload command

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Message-ID: <b457bd8b-cf60-95a6-60eb-33b7a5ec06a4@nvidia.com>
Date:   Tue, 15 Sep 2020 23:06:16 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>
CC:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next RFC v4 01/15] devlink: Add reload action option
 to devlink reload command


On 9/15/2020 4:26 PM, Jiri Pirko wrote:
> Tue, Sep 15, 2020 at 02:12:25PM CEST, moshe@...dia.com wrote:
>> On 9/14/2020 3:27 PM, Jiri Pirko wrote:
>>> Mon, Sep 14, 2020 at 08:07:48AM CEST, moshe@...lanox.com wrote:
> [..]	
> 	
>>>> @@ -7392,6 +7485,11 @@ struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size)
>>>> 	if (!devlink)
>>>> 		return NULL;
>>>> 	devlink->ops = ops;
>>>> +	if (devlink_reload_actions_verify(devlink)) {
>>> Move this check to the beginning. You don't need devlink instance for
>>> the check, just ops.
>>
>> Right, will fix.
>>
>>> also, your devlink_reload_actions_verify() function returns
>>> 0/-ESOMETHING. Treat it accordingly here.
>>
>> Well, yes, but I rather return NULL here since devlink_alloc() failed. If
>> devlink_reload_actions_verify() fails it has WARN_ON which will lead the
>> driver developer to his bug.
> So let the verify() return bool.
> My point is, if a function return 0/-ESOMETHING, you should not check
> the return value directly but you should use int err/ret.


OK, will fix.

>>>> +		kfree(devlink);
>>>> +		return NULL;
>>>> +	}
> [...]