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| author | Johan Hovold <johan@kernel.org> | 2014-08-25 17:51:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-23 21:15:39 -0700 |
| commit | 2a159389bf5d962359349a76827b2f683276a1c7 (patch) | |
| tree | 55877b54e9fe9c7750833078d1afb8eb6977b8b6 | |
| parent | bf17eba7ae1e813b0ad67cb1078dcbd7083b906e (diff) | |
| download | lwn-2a159389bf5d962359349a76827b2f683276a1c7.tar.gz lwn-2a159389bf5d962359349a76827b2f683276a1c7.zip | |
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>
| -rw-r--r-- | drivers/usb/core/hub.c | 3 | ||||
| -rw-r--r-- | include/linux/usb/quirks.h | 3 |
2 files changed, 6 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; diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 55a17b188daa..ffe565c94743 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -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 */ |