From: Ursula Braun <ubraun@linux.vnet.ibm.com>
Date: Wed, 14 Mar 2018 10:01:01 +0000 (+0100)
Subject: net/smc: free link group without pending free_work only
X-Git-Tag: v4.17-rc1~148^2~192^2~1
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=268ffcc4ebfc8b10c1502357dfb82ce6af0770ac;p=linux.git

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@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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 */