USB: core: add device-qualifier quirk

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@mork.no>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d481c99a20d7..c01b72467524 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4538,6 +4538,9 @@ 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;