Patch "usb: gadget: udc: fsl: Add missing complete function." has been added to the 4.4-stable tree

Patch "usb: gadget: udc: fsl: Add missing complete function." 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: gadget: udc: fsl: Add missing complete function.

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-udc-fsl-add-missing-complete-function.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 5528954a1a0c49c6974ef1b8d6eaceff536204d5 Mon Sep 17 00:00:00 2001
From: Magnus Lilja <lilja.magnus@gmail.com>
Date: Wed, 25 Jan 2017 22:07:59 +0100
Subject: usb: gadget: udc: fsl: Add missing complete function.

From: Magnus Lilja <lilja.magnus@gmail.com>

commit 5528954a1a0c49c6974ef1b8d6eaceff536204d5 upstream.

Commit 304f7e5e1d08 ("usb: gadget: Refactor request completion")
removed check if req->req.complete is non-NULL, resulting in a NULL
pointer derefence and a kernel panic.
This patch adds an empty complete function instead of re-introducing
the req->req.complete check.

Fixes: 304f7e5e1d08 ("usb: gadget: Refactor request completion")

Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/udc/fsl_udc_core.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/usb/gadget/udc/fsl_udc_core.c
+++ b/drivers/usb/gadget/udc/fsl_udc_core.c
@@ -1249,6 +1249,12 @@ static const struct usb_gadget_ops fsl_g
 	.udc_stop = fsl_udc_stop,
 };
 
+/*
+ * Empty complete function used by this driver to fill in the req->complete
+ * field when creating a request since the complete field is mandatory.
+ */
+static void fsl_noop_complete(struct usb_ep *ep, struct usb_request *req) { }
+
 /* Set protocol stall on ep0, protocol stall will automatically be cleared
    on new transaction */
 static void ep0stall(struct fsl_udc *udc)
@@ -1283,7 +1289,7 @@ static int ep0_prime_status(struct fsl_u
 	req->req.length = 0;
 	req->req.status = -EINPROGRESS;
 	req->req.actual = 0;
-	req->req.complete = NULL;
+	req->req.complete = fsl_noop_complete;
 	req->dtd_count = 0;
 
 	ret = usb_gadget_map_request(&ep->udc->gadget, &req->req, ep_is_in(ep));
@@ -1366,7 +1372,7 @@ static void ch9getstatus(struct fsl_udc
 	req->req.length = 2;
 	req->req.status = -EINPROGRESS;
 	req->req.actual = 0;
-	req->req.complete = NULL;
+	req->req.complete = fsl_noop_complete;
 	req->dtd_count = 0;
 
 	ret = usb_gadget_map_request(&ep->udc->gadget, &req->req, ep_is_in(ep));


Patches currently in stable-queue which might be from lilja.magnus@gmail.com are

queue-4.4/dmaengine-ipu-make-sure-the-interrupt-routine-checks-all-interrupts.patch
queue-4.4/usb-gadget-udc-fsl-add-missing-complete-function.patch