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Subject[PATCH 4.9 036/104] IB/ipoib: Replace list_del of the neigh->list with list_del_init
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Feras Daoud <ferasda@mellanox.com>


[ Upstream commit c586071d1dc8227a7182179b8e50ee92cc43f6d2 ]

In order to resolve a situation where a few process delete
the same list element in sequence and cause panic, list_del
is replaced with list_del_init. In this case if the first
process that calls list_del releases the lock before acquiring
it again, other processes who can acquire the lock will call
list_del_init.

Fixes: b63b70d87741 ("IPoIB: Use a private hash table for path lookup")
Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Reviewed-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/infiniband/ulp/ipoib/ipoib_main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1302,7 +1302,7 @@ static void __ipoib_reap_neigh(struct ip
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from path/mc list */
- list_del(&neigh->list);
+ list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
} else {
np = &neigh->hnext;
@@ -1466,7 +1466,7 @@ void ipoib_neigh_free(struct ipoib_neigh
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from parent list */
- list_del(&neigh->list);
+ list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
return;
} else {
@@ -1551,7 +1551,7 @@ void ipoib_del_neighs_by_gid(struct net_
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from parent list */
- list_del(&neigh->list);
+ list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
} else {
np = &neigh->hnext;
@@ -1593,7 +1593,7 @@ static void ipoib_flush_neighs(struct ip
rcu_dereference_protected(neigh->hnext,
lockdep_is_held(&priv->lock)));
/* remove from path/mc list */
- list_del(&neigh->list);
+ list_del_init(&neigh->list);
call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
}
}

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