netdev - Re: [PATCH net-next v3 1/3] rust: core abstractions for network PHY drivers

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Date: Thu, 12 Oct 2023 03:32:44 -0400
From: Trevor Gross <tmgross@...ch.edu>
To: Boqun Feng <boqun.feng@...il.com>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, netdev@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, andrew@...n.ch, 
	miguel.ojeda.sandonis@...il.com, greg@...ah.com
Subject: Re: [PATCH net-next v3 1/3] rust: core abstractions for network PHY drivers

On Thu, Oct 12, 2023 at 3:13 AM Boqun Feng <boqun.feng@...il.com> wrote:

> If `Device::from_raw`'s safety requirement is "only called in callbacks
> with phydevice->lock held, etc.", then the exclusive access is
> guaranteed by the safety requirement, therefore `mut` can be drop. It's
> a matter of the exact semantics of the APIs.
>
> Regards,
> Boqun

That is correct to my understanding, the core handles
locking/unlocking and no driver functions are called if the core
doesn't hold an exclusive lock first. Which also means the wrapper
type can't be `Sync`.

Andrew said a bit about it in the second comment here:
https://lore.kernel.org/rust-for-linux/ec6d8479-f893-4a3f-bf3e-aa0c81c4adad@lunn.ch/