tree 857d9e129051b69c8207c9785a74849dc03e0158
parent 13cd36a37a06ae0318d23b7e60adf0dac3547238
author David Vrabel <david.vrabel@citrix.com> 1404318323 +0100
committer David Vrabel <david.vrabel@citrix.com> 1404381748 +0100

xen/manage: fix potential deadlock when resuming the console

Calling xen_console_resume() in xen_suspend() causes a warning because
it locks irq_mapping_update_lock (a mutex) and this may sleep.  If a
userspace process is using the evtchn device then this mutex may be
locked at the point of the stop_machine() call and
xen_console_resume() would then deadlock.

Resuming the console after stop_machine() returns avoids this
deadlock.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: <stable@vger.kernel.org>