usbdevfs: Fix broken scatter-gather transfer
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>
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index e0356cb..b78fbe2 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1348,6 +1348,7 @@
ret = -EFAULT;
goto error;
}
+ uurb->buffer += u;
}
totlen -= u;
}