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tcm_fc: Resolve suspicious RCU usage warnings 

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Mark Rustad 2012-06-26 15:57:30 -07:00 committed by Nicholas Bellinger
parent 5134de2815
commit 863555be0c
1 changed files with 2 additions and 1 deletions
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3
drivers/target/tcm_fc/tfc_sess.c
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@ -58,7 +58,8 @@ static struct ft_tport *ft_tport_create(struct fc_lport *lport)
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;