Commit 41097a38 authored by Johan Hovold's avatar Johan Hovold Committed by Luis Henriques

USB: core: add device-qualifier quirk

commit 2a159389 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: 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>
[ luis: prereq for the following Elan touchscreen patches ]
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 785c9338
...@@ -4524,6 +4524,9 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) ...@@ -4524,6 +4524,9 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
struct usb_qualifier_descriptor *qual; struct usb_qualifier_descriptor *qual;
int status; int status;
if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER)
return;
qual = kmalloc (sizeof *qual, GFP_KERNEL); qual = kmalloc (sizeof *qual, GFP_KERNEL);
if (qual == NULL) if (qual == NULL)
return; return;
......
...@@ -33,4 +33,7 @@ ...@@ -33,4 +33,7 @@
/* device generates spurious wakeup, ignore remote wakeup capability */ /* device generates spurious wakeup, ignore remote wakeup capability */
#define USB_QUIRK_IGNORE_REMOTE_WAKEUP 0x00000200 #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 */ #endif /* __LINUX_USB_QUIRKS_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment