[3.16.y-ckt stable] Patch "usb: gadget: printer: enqueue printer's response for setup request" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

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

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt11.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 0ff72fcd394adaf83cecf5d299e5cca65b3e6576 Mon Sep 17 00:00:00 2001
From: Andrzej Pietrasiewicz <andrzej.p at samsung.com>
Date: Tue, 3 Mar 2015 10:52:05 +0100
Subject: 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 at samsung.com>
Signed-off-by: Felipe Balbi <balbi at ti.com>
[ luis: backported to 3.16:
  - file rename: drivers/usb/gadget/legacy/printer.c ->
    drivers/usb/gadget/printer.c ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/gadget/printer.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 6474081dcbaf..c9c6dae75c13 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -980,6 +980,15 @@ 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;
 }