From 2740ac33c87b3d0dfa022efd6ba04c6261b1abbd Mon Sep 17 00:00:00 2001 From: =?utf8?q?Johannes=20Br=C3=BCderl?= Date: Sun, 7 Dec 2025 10:02:20 +0100 Subject: [PATCH] usb: core: add USB_QUIRK_NO_BOS for devices that hang on BOS descriptor MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add USB_QUIRK_NO_BOS quirk flag to skip requesting the BOS descriptor for devices that cannot handle it. Add Elgato 4K X (0fd9:009b) to the quirk table. This device hangs when the BOS descriptor is requested at SuperSpeed Plus (10Gbps). Link: https://bugzilla.kernel.org/show_bug.cgi?id=220027 Cc: stable Signed-off-by: Johannes Brüderl Link: https://patch.msgid.link/20251207090220.14807-1-johannes.bruederl@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/config.c | 5 +++++ drivers/usb/core/quirks.c | 3 +++ include/linux/usb/quirks.h | 3 +++ 3 files changed, 11 insertions(+) diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index baf5bc844b6f..2bb1ceb9d621 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -1040,6 +1040,11 @@ int usb_get_bos_descriptor(struct usb_device *dev) __u8 cap_type; int ret; + if (dev->quirks & USB_QUIRK_NO_BOS) { + dev_dbg(ddev, "skipping BOS descriptor\n"); + return -ENOMSG; + } + bos = kzalloc(sizeof(*bos), GFP_KERNEL); if (!bos) return -ENOMEM; diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 47f589c4104a..c4d85089d19b 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -450,6 +450,9 @@ static const struct usb_device_id usb_quirk_list[] = { { USB_DEVICE(0x0c45, 0x7056), .driver_info = USB_QUIRK_IGNORE_REMOTE_WAKEUP }, + /* Elgato 4K X - BOS descriptor fetch hangs at SuperSpeed Plus */ + { USB_DEVICE(0x0fd9, 0x009b), .driver_info = USB_QUIRK_NO_BOS }, + /* Sony Xperia XZ1 Compact (lilac) smartphone in fastboot mode */ { USB_DEVICE(0x0fce, 0x0dde), .driver_info = USB_QUIRK_NO_LPM }, diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 59409c1fc3de..2f7bd2fdc616 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -75,4 +75,7 @@ /* short SET_ADDRESS request timeout */ #define USB_QUIRK_SHORT_SET_ADDRESS_REQ_TIMEOUT BIT(16) +/* skip BOS descriptor request */ +#define USB_QUIRK_NO_BOS BIT(17) + #endif /* __LINUX_USB_QUIRKS_H */ -- 2.47.3