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Thu, 05 Nov 2026 09:05:34 -0800 (PST) Received: from google.com ([2a00:79e0:2ebe:8:c8f4:b7d9:252f:4483]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36ca3989670sm23943795eec.25.2026.11.05.09.05.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 09:05:33 -0800 (PST) Date: Thu, 5 Nov 2026 09:05:29 -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> X-Mailing-List: linux-kernel@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: <20261105-device-trust-core-v1-2-1e536825b4eb@nvidia.com> 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. ... And I even thinking if we really need to keep these custom attributes or if I can rip them out in the future ... Thanks. -- Dmitry