From: Ursula Braun <ubraun@linux.ibm.com>
Date: Thu, 14 Nov 2019 13:02:44 +0100
Subject: net/smc: no WR buffer wait for terminating link group
Git-commit: 15e1b99aadfb2766f9379a23a0fc1d4336c8cd8e
Patch-mainline: v5.5-rc1
References: jsc#SLE-7395

Avoid waiting for a free work request buffer, if the link group
is already terminating.

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_llc.c |    3 +++
 net/smc/smc_wr.c  |   10 ++++++----
 net/smc/smc_wr.h  |   10 ++++++++++
 3 files changed, 19 insertions(+), 4 deletions(-)

--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -656,6 +656,7 @@ void smc_llc_link_active(struct smc_link
 void smc_llc_link_deleting(struct smc_link *link)
 {
 	link->state = SMC_LNK_DELETING;
+	smc_wr_wakeup_tx_wait(link);
 }
 
 /* called in tasklet context */
@@ -663,6 +664,8 @@ void smc_llc_link_inactive(struct smc_li
 {
 	link->state = SMC_LNK_INACTIVE;
 	cancel_delayed_work(&link->llc_testlink_wrk);
+	smc_wr_wakeup_reg_wait(link);
+	smc_wr_wakeup_tx_wait(link);
 }
 
 /* called in worker context */
--- a/net/smc/smc_wr.c
+++ b/net/smc/smc_wr.c
@@ -75,7 +75,7 @@ static inline void smc_wr_tx_process_cqe
 			link->wr_reg_state = FAILED;
 		else
 			link->wr_reg_state = CONFIRMED;
-		wake_up(&link->wr_reg_wait);
+		smc_wr_wakeup_reg_wait(link);
 		return;
 	}
 
@@ -171,6 +171,7 @@ int smc_wr_tx_get_free_slot(struct smc_l
 			    struct smc_rdma_wr **wr_rdma_buf,
 			    struct smc_wr_tx_pend_priv **wr_pend_priv)
 {
+	struct smc_link_group *lgr = smc_get_lgr(link);
 	struct smc_wr_tx_pend *wr_pend;
 	u32 idx = link->wr_tx_cnt;
 	struct ib_send_wr *wr_ib;
@@ -179,19 +180,20 @@ int smc_wr_tx_get_free_slot(struct smc_l
 
 	*wr_buf = NULL;
 	*wr_pend_priv = NULL;
-	if (in_softirq()) {
+	if (in_softirq() || lgr->terminating) {
 		rc = smc_wr_tx_get_free_slot_index(link, &idx);
 		if (rc)
 			return rc;
 	} else {
-		rc = wait_event_timeout(
+		rc = wait_event_interruptible_timeout(
 			link->wr_tx_wait,
 			link->state == SMC_LNK_INACTIVE ||
+			lgr->terminating ||
 			(smc_wr_tx_get_free_slot_index(link, &idx) != -EBUSY),
 			SMC_WR_TX_WAIT_FREE_SLOT_TIME);
 		if (!rc) {
 			/* timeout - terminate connections */
-			smc_lgr_terminate_sched(smc_get_lgr(link));
+			smc_lgr_terminate_sched(lgr);
 			return -EPIPE;
 		}
 		if (idx == link->wr_tx_cnt)
--- a/net/smc/smc_wr.h
+++ b/net/smc/smc_wr.h
@@ -60,6 +60,16 @@ static inline void smc_wr_tx_set_wr_id(a
 	atomic_long_set(wr_tx_id, val);
 }
 
+static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
+{
+	wake_up_all(&lnk->wr_tx_wait);
+}
+
+static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
+{
+	wake_up(&lnk->wr_reg_wait);
+}
+
 /* post a new receive work request to fill a completed old work request entry */
 static inline int smc_wr_rx_post(struct smc_link *link)
 {