openwrt/target/linux/generic/patches-4.4/821-usb-Remove-annoying-warning-about-bogus-URB.patch

From f13ad28ba4280d2283ca2b49f0bd384bc51e6a68 Mon Sep 17 00:00:00 2001
From: Alexey Brodkin <abrodkin@synopsys.com>
Date: Tue, 5 Jul 2016 14:28:31 +0300
Subject: [PATCH] usb: Remove annoying warning about bogus URB

When ath9k-htc Wi-Fi dongle is used with generic OHCI controller
infinite stream of warnings appears in debug console like this:
-------------------------->8----------------------
usb 1-1: new full-speed USB device number 2 using ohci-platform
usb 1-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
usb 1-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size:
51008
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19 at drivers/usb/core/urb.c:449
usb_submit_urb+0x1b4/0x498()
usb 1-1: BOGUS urb xfer, pipe 1 != type 3
Modules linked in:
CPU: 0 PID: 19 Comm: kworker/0:1 Not tainted
4.4.0-rc4-00017-g00e2d79-dirty #3
Workqueue: events request_firmware_work_func

Stack Trace:
  arc_unwind_core.constprop.1+0xa4/0x110
---[ end trace 649ef8c342817fc2 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19 at drivers/usb/core/urb.c:449
usb_submit_urb+0x1b4/0x498()
usb 1-1: BOGUS urb xfer, pipe 1 != type 3
Modules linked in:
CPU: 0 PID: 19 Comm: kworker/0:1 Tainted: G        W
4.4.0-rc4-00017-g00e2d79-dirty #3
Workqueue: events request_firmware_work_func

Stack Trace:
  arc_unwind_core.constprop.1+0xa4/0x110
---[ end trace 649ef8c342817fc3 ]---
------------[ cut here ]------------
-------------------------->8----------------------

There're some discussions in mailing lists proposing to disable
that particular check alltogether and magically all seem to work
fine with muted warning.

Anyways new thread on that regard could be found here:
http://lists.infradead.org/pipermail/linux-snps-arc/2016-July/001310.html

Let's see what comes out of that new discussion, hopefully patching
of generic USB stuff won't be required then.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
 drivers/usb/core/urb.c | 5 -----
 1 file changed, 5 deletions(-)

--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -323,9 +323,6 @@ EXPORT_SYMBOL_GPL(usb_unanchor_urb);
  */
 int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 {
-	static int			pipetypes[4] = {
-		PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
-	};
 	int				xfertype, max;
 	struct usb_device		*dev;
 	struct usb_host_endpoint	*ep;
@@ -443,11 +440,6 @@ int usb_submit_urb(struct urb *urb, gfp_
 	 * cause problems in HCDs if they get it wrong.
 	 */
 
-	/* Check that the pipe's type matches the endpoint's type */
-	if (usb_pipetype(urb->pipe) != pipetypes[xfertype])
-		dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
-			usb_pipetype(urb->pipe), pipetypes[xfertype]);
-
 	/* Check against a simple/standard policy */
 	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT | URB_DIR_MASK |
 			URB_FREE_BUFFER);