usb: chipidea: udc: don't truncate requests to single tds

It is not safe to truncate requests to the maximum possible size the
controller can handle with one td and to keep working. That patch fixes
that with proper error handling instead.

Reported-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 20a5b79..0531532 100644 (file)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1158,9 +1158,9 @@ static int ep_queue(struct usb_ep *ep, struct usb_request *req,
        }
 
        if (req->length > 4 * CI13XXX_PAGE_SIZE) {
-               req->length = 4 * CI13XXX_PAGE_SIZE;
                retval = -EMSGSIZE;
-               dev_warn(mEp->ci->dev, "request length truncated\n");
+               dev_err(mEp->ci->dev, "request bigger than one td\n");
+               goto done;
        }
 
        /* push request */