From: Joe Lawrence <joe.lawrence@stratus.com>
Date: Wed, 10 Sep 2014 19:07:50 +0000 (-0400)
Subject: usb: hub: take hub->hdev reference when processing from eventlist
X-Git-Tag: v3.2.64~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c20e37c1d0975eca131a6b1d86f3a50d3e4caac;p=pandora-kernel.git

usb: hub: take hub->hdev reference when processing from eventlist

commit c605f3cdff53a743f6d875b76956b239deca1272 upstream.

During surprise device hotplug removal tests, it was observed that
hub_events may try to call usb_lock_device on a device that has already
been freed. Protect the usb_device by taking out a reference (under the
hub_event_lock) when hub_events pulls it off the list, returning the
reference after hub_events is finished using it.

Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Suggested-by: David Bulkow <david.bulkow@stratus.com> for using kref
Suggested-by: Alan Stern <stern@rowland.harvard.edu> for placement
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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