From: Andrzej Pietrasiewicz Date: Tue, 3 Mar 2015 09:52:05 +0000 (+0100) Subject: usb: gadget: printer: enqueue printer's response for setup request X-Git-Tag: firefly_0821_release~3679^2~459 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=db8349883cf762fe8862b514c1b510d04cb39928;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Felipe Balbi [ported to stable 3.10 and 3.14] Signed-off-by: Andrzej Pietrasiewicz Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c index bf7a56b6d48a..a0dfdbddbf08 100644 --- 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; }