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Date: Wed, 29 Apr 2026 23:41:38 +0200
Message-Id: <DI5YRSXD3NAC.27M8UD3I3VY3M@kernel.org>
Subject: Re: [PATCH] drivers: base: Set mod->async_probe_requested if needed
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rafael J . Wysocki"
 <rafael@kernel.org>, <driver-core@lists.linux.dev>, "Luis Chamberlain"
 <mcgrof@kernel.org>, "Petr Pavlu" <petr.pavlu@suse.com>, "Daniel Gomez"
 <da.gomez@kernel.org>, "Sami Tolvanen" <samitolvanen@google.com>, "Aaron
 Tomlin" <atomlin@atomlin.com>, "Igor Pylypiv" <ipylypiv@google.com>,
 "Chung-Kai Mei" <chungkai@google.com>, "Luis R. Rodriguez"
 <mcgrof@suse.com>, <stable@vger.kernel.org>
To: "Bart Van Assche" <bvanassche@acm.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260407160511.56289-1-bvanassche@acm.org>
 <DI4ZX1HOWDNH.3G36YTI0MYC76@kernel.org>
 <2fc4a2af-a4bb-4797-87eb-e95b835aa673@acm.org>
In-Reply-To: <2fc4a2af-a4bb-4797-87eb-e95b835aa673@acm.org>

(Cc: Luis)

On Tue Apr 28, 2026 at 9:39 PM CEST, Bart Van Assche wrote:
> On 4/28/26 11:22 AM, Danilo Krummrich wrote:
>> What if userspace did explicitly pass async_probe=3D0?
>
> Does this mean that what the user has configured should take precedence,
> as in the untested patch below?

Yes, but my concern actually goes beyond that (sorry for not expressing thi=
s
properly right away).

I think the whole reason the async_probe module parameter exists in the fir=
st
place is because userspace may rely on the devices being handled by the mod=
ule
to be available directly after returning from the syscall.

Even worse, with this patch we would make this user facing behavior depende=
nt on
an implementation detail of the driver, i.e. whether it chooses to opt into
PROBE_PREFER_ASYNCHRONOUS.