From: Ursula Braun <ubraun@linux.ibm.com>
Date: Thu, 10 Sep 2020 18:48:26 +0200
Subject: net/smc: immediate freeing in smc_lgr_cleanup_early()
Git-commit: f9aab6f2ce5761374daa7a65b006bebe04b5591f
Patch-mainline: v5.10-rc1
References: jsc#SLE-13763

smc_lgr_cleanup_early() schedules the free worker with delay. DMB
unregistering occurs in this delayed worker increasing the risk
to reach the SMCD SBA limit without need. Terminate the
linkgroup immediately, since termination means early DMB unregistering.

For SMCD the global smc_server_lgr_pending lock is given up early.
A linkgroup to be given up with smc_lgr_cleanup_early() may already
contain more than one connection. Using __smc_lgr_terminate() in
smc_lgr_cleanup_early() covers this.

And consolidate smc_ism_put_vlan() and smc_put_device() into smc_lgr_free()
only.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/smc_core.c |   23 ++++-------------------
 net/smc/smc_core.h |    1 -
 2 files changed, 4 insertions(+), 20 deletions(-)

--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -34,7 +34,6 @@
 #define SMC_LGR_NUM_INCR		256
 #define SMC_LGR_FREE_DELAY_SERV		(600 * HZ)
 #define SMC_LGR_FREE_DELAY_CLNT		(SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
-#define SMC_LGR_FREE_DELAY_FAST		(8 * HZ)
 
 static struct smc_lgr_list smc_lgr_list = {	/* established link groups */
 	.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
@@ -70,7 +69,7 @@ static void smc_lgr_schedule_free_work(s
 	 * creation. For client use a somewhat higher removal delay time,
 	 * otherwise there is a risk of out-of-sync link groups.
 	 */
-	if (!lgr->freeing && !lgr->freefast) {
+	if (!lgr->freeing) {
 		mod_delayed_work(system_wq, &lgr->free_work,
 				 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
 						SMC_LGR_FREE_DELAY_CLNT :
@@ -78,15 +77,6 @@ static void smc_lgr_schedule_free_work(s
 	}
 }
 
-void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
-{
-	if (!lgr->freeing && !lgr->freefast) {
-		lgr->freefast = 1;
-		mod_delayed_work(system_wq, &lgr->free_work,
-				 SMC_LGR_FREE_DELAY_FAST);
-	}
-}
-
 /* Register connection's alert token in our lookup structure.
  * To use rbtrees we have to implement our own insert core.
  * Requires @conns_lock
@@ -227,7 +217,7 @@ void smc_lgr_cleanup_early(struct smc_co
 	if (!list_empty(lgr_list))
 		list_del_init(lgr_list);
 	spin_unlock_bh(lgr_lock);
-	smc_lgr_schedule_free_work_fast(lgr);
+	__smc_lgr_terminate(lgr, true);
 }
 
 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
@@ -399,7 +389,6 @@ static int smc_lgr_create(struct smc_soc
 	lgr->is_smcd = ini->is_smcd;
 	lgr->sync_err = 0;
 	lgr->terminating = 0;
-	lgr->freefast = 0;
 	lgr->freeing = 0;
 	lgr->vlan_id = ini->vlan_id;
 	mutex_init(&lgr->sndbufs_lock);
@@ -825,10 +814,8 @@ static void smc_lgr_free(struct smc_link
 
 	smc_lgr_free_bufs(lgr);
 	if (lgr->is_smcd) {
-		if (!lgr->terminating) {
-			smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
-			put_device(&lgr->smcd->dev);
-		}
+		smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
+		put_device(&lgr->smcd->dev);
 		if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
 			wake_up(&lgr->smcd->lgrs_deleted);
 	} else {
@@ -889,8 +876,6 @@ static void smc_lgr_cleanup(struct smc_l
 	if (lgr->is_smcd) {
 		smc_ism_signal_shutdown(lgr);
 		smcd_unregister_all_dmbs(lgr);
-		smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
-		put_device(&lgr->smcd->dev);
 	} else {
 		u32 rsn = lgr->llc_termination_rsn;
 
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -227,7 +227,6 @@ struct smc_link_group {
 	struct work_struct	terminate_work;	/* abnormal lgr termination */
 	u8			sync_err : 1;	/* lgr no longer fits to peer */
 	u8			terminating : 1;/* lgr is terminating */
-	u8			freefast : 1;	/* free worker scheduled fast */
 	u8			freeing : 1;	/* lgr is being freed */
 
 	bool			is_smcd;	/* SMC-R or SMC-D */