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Date: Tue, 28 Apr 2026 21:09:04 +0200
Message-Id: <DI50WG9XK1I4.1R6DXSZSWFRDC@kernel.org>
Subject: Re: [PATCH] driver core: reject devices with unregistered buses
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rafael J . Wysocki"
 <rafael@kernel.org>, <driver-core@lists.linux.dev>,
 <linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>
To: "Johan Hovold" <johan@kernel.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260427102852.2174-1-johan@kernel.org>
In-Reply-To: <20260427102852.2174-1-johan@kernel.org>

On Mon Apr 27, 2026 at 12:28 PM CEST, Johan Hovold wrote:
> Trying to register a device on a bus which has not yet been registered
> used to trigger a NULL-pointer dereference, but since the const bus
> structure rework registration instead succeeds without the device being
> added to the bus.
>
> Reject devices with unregistered buses to catch any callers that get
> the ordering wrong and to handle bus registration failures more
> gracefully.
>
> Fixes: 5221b82d46f2 ("driver core: bus: bus_add/probe/remove_device() cle=
anups")
> Cc: stable@vger.kernel.org	# 6.3

Hm...this sounds like hardening and not like a "real" bug fix. Do you have =
a
specific reason why you added Cc: stable?