diff options
| author | Sven Eckelmann <sven@narfation.org> | 2016-01-05 12:06:25 +0100 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2016-02-03 00:01:12 +0000 |
| commit | 7ec2a7c6ad4bf677924f9560aecd18b349fb75b4 (patch) | |
| tree | 0f9bcc669fd90da27476d841dc56dc063bb54504 /net/batman-adv/hard-interface.h | |
| parent | a03f20f4e7682751dea2d192306c4fb995432468 (diff) | |
batman-adv: Drop immediate batadv_hard_iface free function
commit b4d922cfc9c08318eeb77d53b7633740e6b0efb0 upstream.
It is not allowed to free the memory of an object which is part of a list
which is protected by rcu-read-side-critical sections without making sure
that no other context is accessing the object anymore. This usually happens
by removing the references to this object and then waiting until the rcu
grace period is over and no one (allowedly) accesses it anymore.
But the _now functions ignore this completely. They free the object
directly even when a different context still tries to access it. This has
to be avoided and thus these functions must be removed and all functions
have to use batadv_hardif_free_ref.
Fixes: 89652331c00f ("batman-adv: split tq information in neigh_node struct")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'net/batman-adv/hard-interface.h')
| -rw-r--r-- | net/batman-adv/hard-interface.h | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h index 1918cd50b62e..b6bff9c1877a 100644 --- a/net/batman-adv/hard-interface.h +++ b/net/batman-adv/hard-interface.h @@ -64,18 +64,6 @@ batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface) call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu); } -/** - * batadv_hardif_free_ref_now - decrement the hard interface refcounter and - * possibly free it (without rcu callback) - * @hard_iface: the hard interface to free - */ -static inline void -batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface) -{ - if (atomic_dec_and_test(&hard_iface->refcount)) - batadv_hardif_free_rcu(&hard_iface->rcu); -} - static inline struct batadv_hard_iface * batadv_primary_if_get_selected(struct batadv_priv *bat_priv) { |