netdev - [PATCH net-next 2/3] net/smc: free link group without pending free

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Date:   Wed, 14 Mar 2018 11:01:01 +0100
From:   Ursula Braun <ubraun@...ux.vnet.ibm.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-rdma@...r.kernel.org, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, raspl@...ux.vnet.ibm.com,
        ubraun@...ux.vnet.ibm.com
Subject: [PATCH net-next 2/3] net/smc: free link group without pending free_work only

Make sure there is no pending or running free_work worker for the link
group when freeing the link group.

Signed-off-by: Ursula Braun <ubraun@...ux.vnet.ibm.com>
---
 net/smc/af_smc.c   | 1 +
 net/smc/smc_core.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 2c6f4e0a9f3d..649489f825a5 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1477,6 +1477,7 @@ static void __exit smc_exit(void)
 	spin_unlock_bh(&smc_lgr_list.lock);
 	list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
 		list_del_init(&lgr->list);
+		cancel_delayed_work_sync(&lgr->free_work);
 		smc_lgr_free(lgr); /* free link group */
 	}
 	static_branch_disable(&tcp_have_smc);
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index f76f60e463cb..ec6189fe2a48 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -140,7 +140,8 @@ static void smc_lgr_free_work(struct work_struct *work)
 	list_del_init(&lgr->list); /* remove from smc_lgr_list */
 free:
 	spin_unlock_bh(&smc_lgr_list.lock);
-	smc_lgr_free(lgr);
+	if (!delayed_work_pending(&lgr->free_work))
+		smc_lgr_free(lgr);
 }
 
 /* create a new SMC link group */
-- 
2.13.5