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Fri, 23 Oct 2026 00:04:28 -0700 (PDT) Received: from SAJV1N5.lan ([14.139.240.50]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-369d9de33acsm4764472eec.20.2026.10.23.00.04.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2026 00:04:27 -0700 (PDT) From: Divyanshu Jha To: Oliver Neukum , netdev@vger.kernel.org Cc: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Divyanshu Jha Subject: [PATCH net-next] net: usb: cdc_ncm: add Apple Silicon MacBook Air (05ac:1903) device ID Date: Fri, 23 Oct 2026 12:34:19 +0530 Message-ID: <20261023070419.235361-1-divyanshuj2006@gmail.com> X-Mailer: git-send-email 2.47.3 X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Apple Silicon MacBook Air exposes a CDC-NCM interface (05ac:1903) when connected host-to-host over USB-C. Like other Apple CDC-NCM peripherals (0x1902 and 0x1905), Apple's firmware omits the CDC status interrupt endpoint. This causes the standard cdc_ncm probe to fail with a missing endpoint error. Add device ID 05ac:1903 to cdc_ncm_devs binding to apple_private_interface_info so the driver bypasses the interrupt check and initializes host-to-host networking successfully. Signed-off-by: Divyanshu Jha --- drivers/net/usb/cdc_ncm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 35db38cb3..6848b9421 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -2019,6 +2019,12 @@ static const struct usb_device_id cdc_devs[] = { { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1902, 2), .driver_info = (unsigned long)&apple_private_interface_info, }, + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1903, 0), + .driver_info = (unsigned long)&apple_private_interface_info, + }, + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1903, 2), + .driver_info = (unsigned long)&apple_private_interface_info, + }, { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1905, 0), .driver_info = (unsigned long)&apple_private_interface_info, }, -- 2.47.3