Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2a159389 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
Browse files

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: default avatarBjørn Mork <bjorn@mork.no>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bf17eba7

drivers/usb/core/hub.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/usb/quirks.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */