Add new quirk for devices that cannot handle requests for the device_qualifier descriptor. A USB-2.0 compliant device must respond to requests for the device_qualifier descriptor (even if it's with a request error), but at least one device is known to misbehave after such a request. Suggested-by: Bjørn Mork <bjorn@xxxxxxx> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> --- drivers/usb/core/hub.c | 3 +++ include/linux/usb/quirks.h | 3 +++ 2 files changed, 6 insertions(+) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 0e950ad..e563164 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4475,6 +4475,9 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) struct usb_qualifier_descriptor *qual; int status; + if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) + return; + qual = kmalloc (sizeof *qual, GFP_KERNEL); if (qual == NULL) return; diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 55a17b1..ffe565c 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -41,4 +41,7 @@ */ #define USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL 0x00000080 +/* device can't handle device_qualifier descriptor requests */ +#define USB_QUIRK_DEVICE_QUALIFIER 0x00000100 + #endif /* __LINUX_USB_QUIRKS_H */ -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
