| From | Greg Kroah-Hartman <> | Subject | [ 124/187] tcm_fc: Resolve suspicious RCU usage warnings | Date | Thu, 12 Jul 2012 15:34:40 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.4-stable review patch. If anyone has any objections, please let me know.
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From: Mark Rustad <mark.d.rustad@intel.com>
commit 863555be0c81558b1af277addcf68acb8f778860 upstream.
Use rcu_dereference_protected to tell rcu that the ft_lport_lock is held during ft_lport_create. This resolved "suspicious RCU usage" warnings when debugging options are turned on.
Signed-off-by: Mark Rustad <mark.d.rustad@intel.com> Tested-by: Ross Brattain <ross.b.brattain@intel.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/target/tcm_fc/tfc_sess.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/target/tcm_fc/tfc_sess.c +++ b/drivers/target/tcm_fc/tfc_sess.c @@ -58,7 +58,8 @@ static struct ft_tport *ft_tport_create( struct ft_tport *tport; int i; - tport = rcu_dereference(lport->prov[FC_TYPE_FCP]); + tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP], + lockdep_is_held(&ft_lport_lock)); if (tport && tport->tpg) return tport;
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