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Date: Tue, 03 Feb 2026 17:29:16 +0100
Message-Id: <DG5GWC5MR1ZC.3VFVRL0G0NMUW@kernel.org>
Subject: Re: [PATCH v2 3/6] rust: device: Support testing devices for
 equality
Cc: "Matthew Maurer" <mmaurer@google.com>, "Bjorn Andersson"
 <andersson@kernel.org>, "Konrad Dybcio" <konradybcio@kernel.org>, "Satya
 Durga Srinivasu Prabhala" <satyap@quicinc.com>, "Miguel Ojeda"
 <ojeda@kernel.org>, "Boqun Feng" <boqun.feng@gmail.com>, "Gary Guo"
 <gary@garyguo.net>, =?utf-8?q?Bj=C3=B6rn_Roy_Baron?=
 <bjorn3_gh@protonmail.com>, "Benno Lossin" <lossin@kernel.org>, "Andreas
 Hindborg" <a.hindborg@kernel.org>, "Alice Ryhl" <aliceryhl@google.com>,
 "Trevor Gross" <tmgross@umich.edu>, "Daniel Almeida"
 <daniel.almeida@collabora.com>, "Rafael J. Wysocki" <rafael@kernel.org>,
 "David Airlie" <airlied@gmail.com>, "Simona Vetter" <simona@ffwll.ch>,
 "Michal Wilczynski" <m.wilczynski@samsung.com>, "Dave Ertman"
 <david.m.ertman@intel.com>, "Ira Weiny" <ira.weiny@intel.com>, "Leon
 Romanovsky" <leon@kernel.org>, "Trilok Soni" <tsoni@quicinc.com>,
 <linux-kernel@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
 <rust-for-linux@vger.kernel.org>, <driver-core@lists.linux.dev>,
 <dri-devel@lists.freedesktop.org>, <linux-pwm@vger.kernel.org>
To: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260203-qcom-socinfo-v2-0-d6719db85637@google.com>
 <20260203-qcom-socinfo-v2-3-d6719db85637@google.com>
 <2026020338-gratitude-overplay-98b0@gregkh>
In-Reply-To: <2026020338-gratitude-overplay-98b0@gregkh>

On Tue Feb 3, 2026 at 5:17 PM CET, Greg Kroah-Hartman wrote:
> And I don't see what patch in this series uses this, am I missing it?

	impl Smem {
	    pub(crate) fn access<'a>(&'a self, dev: &'a Device<Bound>) -> Option<&=
'a Mmio> {
	        if *dev !=3D *self.dev {
	            return None;
	        }
=09
	        // SAFETY: By our invariant, this was a subrange of what was retur=
ned by smem_aux_get, for
	        // self.dev, and by our above check, that auxdev is still availabl=
e.
	        Some(unsafe { Mmio::from_raw(&self.raw) })
	    }
	}

It's used to ensure that the Smem provided by the auxiliary parent can only=
 be
accessed as long as the auxiliary parent device is bound.