Patch "usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align" has been added to the 4.4-stable tree

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

usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align

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-gadget-fix-usb_ep_align_maybe-endianness-and-new-usb_ep_align.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 <[email protected]> know about it.

From: "Felipe F. Tonello" <[email protected]>
Date: Mon, 8 Aug 2016 21:30:04 +0100
Subject: usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align

From: Felipe F. Tonello <[email protected]>

commit 16b114a6d7973cf027e4c2b23eae1076eaf98c25 upstream.

USB spec specifies wMaxPacketSize to be little endian (as other properties), so when using this variable in the driver we should convert to the current CPU endianness if necessary.

This patch also introduces usb_ep_align() which does always returns the aligned buffer size for an endpoint. This is useful to be used by USB requests allocator functions.

---
 include/linux/usb/gadget.h |   17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

@@ -663,8 +663,20 @@ static inline struct usb_gadget *dev_to_
 	list_for_each_entry(tmp, &(gadget)->ep_list, ep_list)
 
 /**
+ * usb_ep_align - returns @len aligned to ep's maxpacketsize.
+ * @ep: the endpoint whose maxpacketsize is used to align @len
+ * @len: buffer size's length to align to @ep's maxpacketsize
+ *
+ * This helper is used to align buffer's size to an ep's maxpacketsize.
+ */
+static inline size_t usb_ep_align(struct usb_ep *ep, size_t len)
+{
+	return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize));
+}
+
+/**
  * usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget
- *	requires quirk_ep_out_aligned_size, otherwise reguens len.
+ *	requires quirk_ep_out_aligned_size, otherwise returns len.
  * @g: controller to check for quirk
  * @ep: the endpoint whose maxpacketsize is used to align @len
  * @len: buffer size's length to align to @ep's maxpacketsize

@@ -675,8 +687,7 @@ static inline struct usb_gadget *dev_to_
 static inline size_t
 usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len)
 {
-	return !g->quirk_ep_out_aligned_size ? len :
-			round_up(len, (size_t)ep->desc->wMaxPacketSize);
+	return g->quirk_ep_out_aligned_size ? usb_ep_align(ep, len) : len;
 }
 
 /**

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/usb-gadget-change-len-to-size_t-on-alloc_ep_req.patch queue-4.4/usb-gadget-define-free_ep_req-as-universal-function.patch queue-4.4/usb-gadget-fix-usb_ep_align_maybe-endianness-and-new-usb_ep_align.patch queue-4.4/usb-gadget-align-buffer-size-when-allocating-for-out-endpoint.patch