From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Date: Thu, 16 Jun 2011 20:06:04 +0000 (-0700)
Subject: USB: Fix up URB error codes to reflect implementation.
X-Git-Tag: v3.0-rc6~29^2~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9e758634f464ffb09344821a9f0b5a5c6df2b3e;p=pandora-kernel.git

USB: Fix up URB error codes to reflect implementation.

Documentation/usb/error-codes.txt mentions that urb->status can be set to
-EXDEV, if the isochronous transfer was not fully completed.  However, in
practice, EHCI, UHCI, and OHCI all only set -EXDEV in the individual frame
status, never in the URB status.  Those host controller actually always
pass in a zero status to usb_hcd_giveback_urb, and rely on the core to set
the appropriate status value.

The xHCI driver ran into issues with the uvcvideo driver when it tried to
set -EXDEV in urb->status, because the driver refused to submit URBs, and
the userspace camera application's video froze.

Clean up the documentation to reflect the actual implementation.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
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