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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>
This commit is contained in:
Andrzej Pietrasiewicz 2015-03-03 10:52:05 +01:00 committed by Greg Kroah-Hartman
parent 228dae6521
commit db8349883c
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/gadget/printer.c
View File

@ -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;
}