linux-kernel - [ 04/85] usbdevfs: Fix broken scatter-gather transfer

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Message-Id: <20121026000031.575096656@linuxfoundation.org>
Date:	Thu, 25 Oct 2012 17:05:22 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Peter Stuge <peter@...ge.se>,
	Hans de Goede <hdegoede@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Henrik Rydberg <rydberg@...omail.se>
Subject: [ 04/85] usbdevfs: Fix broken scatter-gather transfer

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Henrik Rydberg <rydberg@...omail.se>

commit 014639003c77a51fc319c9fdf225e7747cb6e18d upstream.

The handling of large output bulk transfers is broken; the same user
page is read over and over again. Fixed with this patch.

Acked-by: Peter Stuge <peter@...ge.se>
Acked-by: Hans de Goede <hdegoede@...hat.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/devio.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1348,6 +1348,7 @@ static int proc_do_submiturb(struct dev_
 					ret = -EFAULT;
 					goto error;
 				}
+				uurb->buffer += u;
 			}
 			totlen -= u;
 		}


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