[PATCH 4.9 104/153] usb: gadget: udc: fsl: Add missing complete function.

Greg Kroah-Hartman
2017-03-10T09:25:30Z

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));