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USB: core: add device-qualifier quirk

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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>
This commit is contained in:
Johan Hovold 2014-08-25 17:51:26 +02:00 committed by Greg Kroah-Hartman
parent bf17eba7ae
commit 2a159389bf
2 changed files with 6 additions and 0 deletions
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3
drivers/usb/core/hub.c
View File

@ -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;

3
include/linux/usb/quirks.h
View File

@ -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 */