| From 2a159389bf5d962359349a76827b2f683276a1c7 Mon Sep 17 00:00:00 2001 |
| From: Johan Hovold <johan@kernel.org> |
| Date: Mon, 25 Aug 2014 17:51:26 +0200 |
| Subject: USB: core: add device-qualifier quirk |
| MIME-Version: 1.0 |
| Content-Type: text/plain; charset=UTF-8 |
| Content-Transfer-Encoding: 8bit |
| |
| From: Johan Hovold <johan@kernel.org> |
| |
| commit 2a159389bf5d962359349a76827b2f683276a1c7 upstream. |
| |
| 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> |
| |
| --- |
| drivers/usb/core/hub.c | 3 +++ |
| include/linux/usb/quirks.h | 3 +++ |
| 2 files changed, 6 insertions(+) |
| |
| --- a/drivers/usb/core/hub.c |
| +++ b/drivers/usb/core/hub.c |
| @@ -4540,6 +4540,9 @@ check_highspeed (struct usb_hub *hub, st |
| 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; |
| --- a/include/linux/usb/quirks.h |
| +++ b/include/linux/usb/quirks.h |
| @@ -44,4 +44,7 @@ |
| /* device generates spurious wakeup, ignore remote wakeup capability */ |
| #define USB_QUIRK_IGNORE_REMOTE_WAKEUP 0x00000200 |
| |
| +/* device can't handle device_qualifier descriptor requests */ |
| +#define USB_QUIRK_DEVICE_QUALIFIER 0x00000100 |
| + |
| #endif /* __LINUX_USB_QUIRKS_H */ |
