linux-kernel - Re: [PATCH v2 0/4] Improve soundness of bus device abstractions

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Message-ID: <Z9RoSXx7ZGhgOkAD@cassiopeiae>
Date: Fri, 14 Mar 2025 18:32:57 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, bhelgaas@...gle.com,
	ojeda@...nel.org, alex.gaynor@...il.com, gary@...yguo.net,
	bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
	a.hindborg@...nel.org, aliceryhl@...gle.com, tmgross@...ch.edu,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Improve soundness of bus device abstractions

On Fri, Mar 14, 2025 at 10:28:09AM -0700, Boqun Feng wrote:
> On Fri, Mar 14, 2025 at 05:09:03PM +0100, Danilo Krummrich wrote:
> > Currently, when sharing references of bus devices (e.g. ARef<pci::Device>), we
> > do not have a way to restrict which functions of a bus device can be called.
> > 
> > Consequently, it is possible to call all bus device functions concurrently from
> > any context. This includes functions, which access fields of the (bus) device,
> > which are not protected against concurrent access.
> > 
> > This is improved by applying an execution context to the bus device in form of a
> > generic type.
> > 
> > For instance, the PCI device reference that is passed to probe() has the type
> > pci::Device<Core>, which implements all functions that are only allowed to be
> > called from bus callbacks.
> > 
> > The implementation for the default context (pci::Device) contains all functions
> > that are safe to call from any context concurrently.
> > 
> > The context types can be extended as required, e.g. to limit availability  of
> > certain (bus) device functions to probe().
> > 
> > A branch containing the patches can be found in [1].
> > 
> > [1] https://web.git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/device
> > 
> 
> Again,
> 
> Acked-by: Boqun Feng <boqun.feng@...il.com>

Sorry, I forgot to add your ACKs. Thanks for providing it again!