linux-kernel - Re: [PATCH 1/2] rust: pci: impl Send + Sync for pci::Device

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Message-ID: <Z9rDxOJ2V2bPjj5i@google.com>
Date: Wed, 19 Mar 2025 13:16:52 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: bhelgaas@...gle.com, gregkh@...uxfoundation.org, rafael@...nel.org, 
	ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com, 
	gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, 
	a.hindborg@...nel.org, tmgross@...ch.edu, linux-pci@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] rust: pci: impl Send + Sync for pci::Device

On Wed, Mar 19, 2025 at 01:47:01PM +0100, Danilo Krummrich wrote:
> On Wed, Mar 19, 2025 at 12:05:13PM +0000, Alice Ryhl wrote:
> > On Tue, Mar 18, 2025 at 10:29:21PM +0100, Danilo Krummrich wrote:
> > > Commit 7b948a2af6b5 ("rust: pci: fix unrestricted &mut pci::Device")
> > > changed the definition of pci::Device and discarded the implicitly
> > > derived Send and Sync traits.
> > > 
> > > This isn't required by upstream code yet, and hence did not cause any
> > > issues. However, it is relied on by upcoming drivers, hence add it back
> > > in.
> > > 
> > > Signed-off-by: Danilo Krummrich <dakr@...nel.org>
> > 
> > I have a question related to this ... does the Driver trait need to
> > require T: Send?
> 
> The driver trait does not have a generic, it doesn't need one. But I think I
> still get what you're asking.

Right I mean, should it be:

trait Driver: Send + Sync { 
    ...
}

> The driver trait never owns a shared reference of the device, it only ever gives
> out a reference that the driver core guarantees to be valid.
> 
> > The change itself LGTM, so:
> > 
> > Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> > 
> > Alice