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From: Johan Hovold <johan@kernel.org>
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Date: Mon, 25 Aug 2014 17:51:26 +0200
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Subject: [PATCH] USB: core: add device-qualifier quirk
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Add new quirk for devices that cannot handle requests for the
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device_qualifier descriptor.
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A USB-2.0 compliant device must respond to requests for the
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device_qualifier descriptor (even if it's with a request error), but at
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least one device is known to misbehave after such a request.
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Suggested-by: Bjørn Mork <bjorn@mork.no>
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Signed-off-by: Johan Hovold <johan@kernel.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/core/hub.c | 3 +++
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include/linux/usb/quirks.h | 3 +++
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2 files changed, 6 insertions(+)
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diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
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index 6050143ce7ec..9a6d2d6d9fe2 100644
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--- a/drivers/usb/core/hub.c
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+++ b/drivers/usb/core/hub.c
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@@ -4538,6 +4538,9 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
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struct usb_qualifier_descriptor *qual;
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int status;
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+ if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER)
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+ return;
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+
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qual = kmalloc (sizeof *qual, GFP_KERNEL);
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if (qual == NULL)
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return;
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diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h
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index 55a17b188daa..ffe565c94743 100644
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--- a/include/linux/usb/quirks.h
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+++ b/include/linux/usb/quirks.h
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@@ -41,4 +41,7 @@
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*/
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#define USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL 0x00000080
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+/* device can't handle device_qualifier descriptor requests */
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+#define USB_QUIRK_DEVICE_QUALIFIER 0x00000100
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+
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#endif /* __LINUX_USB_QUIRKS_H */
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--
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1.9.3
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