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Thu, 05 Nov 2026 12:34:58 -0800 (PST) Received: from google.com ([2a00:79e0:2ebe:8:c8f4:b7d9:252f:4483]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36f722ed274sm649631eec.18.2026.11.05.12.34.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 12:34:57 -0800 (PST) Date: Thu, 5 Nov 2026 12:34:53 -0800 From: Dmitry Torokhov To: Leon Romanovsky Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Johannes Berg , Jonathan Corbet , Shuah Khan , Randy Dunlap , Bjorn Helgaas , "Joerg Roedel (AMD)" , Suravee Suthikulpanit , Vasant Hegde , Will Deacon , Robin Murphy , David Woodhouse , Lu Baolu , Johan Hovold , Eric Dumazet , Marcel Holtmann , Luiz Augusto von Dentz , Nipun Gupta , Nikhil Agarwal , Pieter Jansen van Vuuren , linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, linux-input@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, iommu@lists.linux.dev, Jason Gunthorpe Subject: Re: [PATCH 02/17] Input: serio - attach manual drivers through the driver core Message-ID: References: <20261105-device-trust-core-v1-0-1e536825b4eb@nvidia.com> <20261105-device-trust-core-v1-2-1e536825b4eb@nvidia.com> <20261105191940.GI8298@unreal> X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105191940.GI8298@unreal> On Thu, Nov 05, 2026 at 09:19:40PM +0200, Leon Romanovsky wrote: > On Thu, Nov 05, 2026 at 09:05:29AM -0800, Dmitry Torokhov wrote: > > On Thu, Nov 05, 2026 at 01:42:15PM +0200, Leon Romanovsky wrote: > > > From: Leon Romanovsky > > > > > > Manual serio binding connects a driver before driver core can admit the > > > device. A rejected binding therefore arrives after functional setup. > > > > > > Keep the port ID check and use device_driver_attach() for the existing bus > > > probe path. Driver core then serializes admission and handles probe failure > > > before publishing the binding. > > > > > > Signed-off-by: Leon Romanovsky > > > --- > > > drivers/input/serio/serio.c | 24 +++--------------------- > > > 1 file changed, 3 insertions(+), 21 deletions(-) > > > > > > diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c > > > index 54dd26249b027..604440244c1ca 100644 > > > --- a/drivers/input/serio/serio.c > > > +++ b/drivers/input/serio/serio.c > > > @@ -81,28 +81,10 @@ static int serio_match_port(const struct serio_device_id *ids, struct serio *ser > > > > > > static int serio_bind_driver(struct serio *serio, struct serio_driver *drv) > > > { > > > - int error; > > > - > > > - if (serio_match_port(drv->id_table, serio)) { > > > - > > > - serio->dev.driver = &drv->driver; > > > - if (serio_connect_driver(serio, drv)) { > > > - serio->dev.driver = NULL; > > > - return -ENODEV; > > > - } > > > + if (!serio_match_port(drv->id_table, serio)) > > > + return 0; > > > > > > - error = device_bind_driver(&serio->dev); > > > - if (error) { > > > - dev_warn(&serio->dev, > > > - "device_bind_driver() failed for %s (%s) and %s, error: %d\n", > > > - serio->phys, serio->name, > > > - drv->description, error); > > > - serio_disconnect_driver(serio); > > > - serio->dev.driver = NULL; > > > - return error; > > > - } > > > - } > > > - return 0; > > > + return device_driver_attach(&drv->driver, &serio->dev); > > > > I am not sure how safe it is, serio (and gameport) have pretty elaborate > > structure and locking rules because they can recurse into themselves (to > > support case of Synaptics touch-pads with pass-through PS/2 ports). > > > > But this call is for user-initiated probing anyways, I am not sure if it > > even needs "trust" handling. > > This patch does not change the locking; the lock was already held on paths such > as the rescan path. This change makes that explicit. Does this enforce synchronous probing? Anyway, I would like to get rid of this special probing in serio core. Given that the code path is only triggered by explicit user request I do not believe we need to worry about supporting trust notion here, so please drop it from the series. Thanks. -- Dmitry