From: SangSu Park <sangsu@gmail.com>
Date: Mon, 22 Sep 2008 22:41:15 +0000 (-0700)
Subject: USB: g_printer: fix handling zero-length packet
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8296345a35551414b07419f4c9223734c1fc5437;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

USB: g_printer: fix handling zero-length packet

g_printer doesn't have to check whether the data size is a multiple of
MaxPacketSize, because device controller driver already make that check.

Signed-off-by: SangSu Park<sangsu@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 2b3b9e1dd2ee..00b7ed5013a6 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -1278,8 +1278,7 @@ unknown:
 	/* respond with data transfer before status phase? */
 	if (value >= 0) {
 		req->length = value;
-		req->zero = value < wLength
-				&& (value % gadget->ep0->maxpacket) == 0;
+		req->zero = value < wLength;
 		value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
 		if (value < 0) {
 			DBG(dev, "ep_queue --> %d\n", value);