net/sched: act_mirred: Don't zero blockid when net device is being deleted

While testing tdc with parallel tests for mirred to block we caught an
intermittent bug. The blockid was being zeroed out when a net device
was deleted and, thus, giving us an incorrect blockid value whenever
we tried to dump the mirred action. Since we don't increment the block
refcount in the control path (and only use the ID), we don't need to
zero the blockid field whenever a net device is going down.

Fixes: 42f39036cda8 ("net/sched: act_mirred: Allow mirred to block")
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20240207222902.1469398-1-victor@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 12386f5..0a1a9e4 100644 (file)
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -533,8 +533,6 @@ static int mirred_device_event(struct notifier_block *unused,
                                 * net_device are already rcu protected.
                                 */
                                RCU_INIT_POINTER(m->tcfm_dev, NULL);
-                       } else if (m->tcfm_blockid) {
-                               m->tcfm_blockid = 0;
                        }
                        spin_unlock_bh(&m->tcf_lock);
                }