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Fri, 17 Jul 2026 12:54:05 -0700 (PDT) Received: from ghost.localdomain ([103.170.252.7]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13ce29c2dcdsm7103119c88.1.2026.07.17.12.53.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2026 12:54:04 -0700 (PDT) Received: from ghost.localdomain (ip6-localhost [::1]) by ghost.localdomain (OpenSMTPD) with ESMTP id 7fc67677; Fri, 17 Jul 2026 19:53:56 +0000 (UTC) From: Nikhil Solanke To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, stern@rowland.harvard.edu, michal.pecio@gmail.com, corbet@lwn.net, skhan@linuxfoundation.org, linux-doc@vger.kernel.org, stable@vger.kernel.org, Nikhil Solanke Subject: [PATCH 0/2] usbcore: Add quirk for 255-byte initial config read Date: Sat, 18 Jul 2026 01:23:34 +0530 Message-ID: <20260717195336.98500-1-nikhilsolanke5@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds a quirk for USB devices that fail enumeration when the initial GET_DESCRIPTOR(CONFIGURATION) request uses wLength=9. Patch 1 adds USB_QUIRK_WINDOWS_CONFIG_REQ_SIZE which causes usb_get_configuration() to use wLength=255 for the initial config descriptor request, mirroring long-standing Windows behavior. Patch 2 splits announce_device() to log device identity before enumeration, improving failure diagnosis. Nikhil Solanke (2): usbcore: Add quirk for 255-bytes initial config read USB: hub: Split announce_device() to log device identity before enumeration .../admin-guide/kernel-parameters.txt | 10 +++++ drivers/usb/core/config.c | 39 +++++++++++++++---- drivers/usb/core/hub.c | 16 ++++++-- drivers/usb/core/quirks.c | 4 ++ include/linux/usb/quirks.h | 3 ++ 5 files changed, 61 insertions(+), 11 deletions(-) -- 2.55.0