linux-kernel - [PATCH] USB: output an error message when the pipe type doesn't match the endpoint type

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Message-ID: <4C7C279C.507@simon.arlott.org.uk>
Date:	Mon, 30 Aug 2010 22:50:20 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Greg KH <greg@...ah.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: [PATCH] USB: output an error message when the pipe type doesn't match
 the endpoint type

Commit f661c6f8c67bd55e93348f160d590ff9edf08904 adds a check of the pipe type if
CONFIG_USB_DEBUG is enabled, but it doesn't output anything if this scenario
occurs.

Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
Cc: Alan Stern <stern@...land.harvard.edu>
---
 drivers/usb/core/urb.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 419e6b3..c14fc08 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -401,8 +401,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 	};
 
 	/* Check that the pipe's type matches the endpoint's type */
-	if (usb_pipetype(urb->pipe) != pipetypes[xfertype])
+	if (usb_pipetype(urb->pipe) != pipetypes[xfertype]) {
+		dev_err(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
+			usb_pipetype(urb->pipe), pipetypes[xfertype]);
 		return -EPIPE;		/* The most suitable error code :-) */
+	}
 
 	/* enforce simple/standard policy */
 	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT | URB_DIR_MASK |
-- 
1.7.0.4
-- 
Simon Arlott
--
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