Patch "usb: ch9: Add size macro for SSP dev cap descriptor" has been added to the 4.4-stable tree

Patch "usb: ch9: Add size macro for SSP dev cap descriptor" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: ch9: Add size macro for SSP dev cap descriptor

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-ch9-add-size-macro-for-ssp-dev-cap-descriptor.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 446fa3a95df1e8b78f25e1babc41e46edd200821 Mon Sep 17 00:00:00 2001
From: John Youn <John.Youn@synopsys.com>
Date: Fri, 5 Feb 2016 17:05:12 -0800
Subject: usb: ch9: Add size macro for SSP dev cap descriptor

From: John Youn <John.Youn@synopsys.com>

commit 446fa3a95df1e8b78f25e1babc41e46edd200821 upstream.

The SuperspeedPlus Device Capability Descriptor has a variable size
depending on the number of sublink speed attributes.

This patch adds a macro to calculate that size. The macro takes one
argument, the Sublink Speed Attribute Count (SSAC) as reported by the
descriptor in bmAttributes[4:0].

See USB 3.1 9.6.2.5, Table 9-19.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/uapi/linux/usb/ch9.h |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -906,6 +906,12 @@ struct usb_ptm_cap_descriptor {
 	__u8  bDevCapabilityType;
 } __attribute__((packed));
 
+/*
+ * The size of the descriptor for the Sublink Speed Attribute Count
+ * (SSAC) specified in bmAttributes[4:0].
+ */
+#define USB_DT_USB_SSP_CAP_SIZE(ssac)	(16 + ssac * 4)
+
 /*-------------------------------------------------------------------------*/
 
 /* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with


Patches currently in stable-queue which might be from John.Youn@synopsys.com are

queue-4.4/usb-ch9-add-size-macro-for-ssp-dev-cap-descriptor.patch