netdev - Re: [RFC net-next 04/10] devlink: always check if the devlink instance is registered

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Date:   Tue, 3 Jan 2023 18:49:59 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     jacob.e.keller@...el.com, leon@...nel.org, netdev@...r.kernel.org
Subject: Re: [RFC net-next 04/10] devlink: always check if the devlink
 instance is registered

On Tue, 3 Jan 2023 10:26:12 +0100 Jiri Pirko wrote:
> >> Why "alive"? To be consistent with the existing terminology, how about
> >> to name it devl_is_registered()?  
> >
> >I dislike the similarity to device_is_registered() which has very
> >different semantics. I prefer alive.  
> 
> Interesting. Didn't occur to me to look into device.h when reading
> devlink.c code. I mean, is device_register() behaviour in sync with
> devlink_register?
> 
> Your alive() helper is checking "register mark". It's an odd and unneded
> inconsistency in newly added code :/

Alright.

> >> Also, "devl_" implicates that it should be called with devlink instance
> >> lock held, so probably devlink_is_registered() would be better.  
> >
> >I'm guessing you realized this isn't correct later on.  
> 
> From what I see, no need to hold instance mutex for xa mark checking,
> alhough I understand why you want the helper to be called with the lock.
> Perhaps assert and a little comment would make this clear?

I'll add the comment. The assert would have to OR holding the subobject
locks. Is that what you had in mind?