usb: gadget: printer: enqueue printer's response for setup request

commit eb132ccbdec5df46e29c9814adf76075ce83576b upstream.

Function-specific setup requests should be handled in such a way, that
apart from filling in the data buffer, the requests are also actually
enqueued: if function-specific setup is called from composte_setup(),
the "usb_ep_queue()" block of code in composite_setup() is skipped.

The printer function lacks this part and it results in e.g. get device id
requests failing: the host expects some response, the device prepares it
but does not equeue it for sending to the host, so the host finally asserts
timeout.

This patch adds enqueueing the prepared responses.

Fixes: 2e87edf49227: "usb: gadget: make g_printer use composite"
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
[ported to stable 3.10 and 3.14]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index bf7a56b6d48ac2c3ebb3acf8920c70d79900d307..a0dfdbddbf085e786098874f6f80171918b18abb 100644 (file)
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -975,6 +975,15 @@ unknown:
                break;
        }
        /* host either stalls (value < 0) or reports success */
+       if (value >= 0) {
+               req->length = value;
+               req->zero = value < wLength;
+               value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+               if (value < 0) {
+                       ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
+                       req->status = 0;
+               }
+       }
        return value;
 }