usbdevfs: Fix broken scatter-gather transfer
authorHenrik Rydberg <rydberg@euromail.se>
Sat, 13 Oct 2012 10:20:36 +0000 (12:20 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 17 Oct 2012 20:41:34 +0000 (13:41 -0700)
The handling of large output bulk transfers is broken; the same user
page is read over and over again. Fixed with this patch.

Cc: stable <stable@vger.kernel.org>
Acked-by: Peter Stuge <peter@stuge.se>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/devio.c

index e0356cb859b5910eaaf5aa6e0b324808c56f4c0a..b78fbe222b72c2e3bc662973e9f9f08941ce2628 100644 (file)
@@ -1348,6 +1348,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                                        ret = -EFAULT;
                                        goto error;
                                }
+                               uurb->buffer += u;
                        }
                        totlen -= u;
                }