From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 27 Mar 2013 00:30:17 +0000 (-0400)
Subject: vt: synchronize_rcu() under spinlock is not nice...
X-Git-Tag: v3.2.43~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c39ea1c36ac173cd07643f91e19671de3fe377e2;p=pandora-kernel.git

vt: synchronize_rcu() under spinlock is not nice...

commit e8cd81693bbbb15db57d3c9aa7dd90eda4842874 upstream.

vcs_poll_data_free() calls unregister_vt_notifier(), which calls
atomic_notifier_chain_unregister(), which calls synchronize_rcu().
Do it *after* we'd dropped ->f_lock.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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