From bddec074a2aa1a475a049d855d6195c6caf517c3 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Thu, 19 Jan 2017 17:06:06 -0800
Subject: [PATCH] scst_sgv: Convert to kernel v4.10

---
 scst/src/scst_mem.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/scst/src/scst_mem.c b/scst/src/scst_mem.c
index 74c852d7d..b8ca0f207 100644
--- a/scst/src/scst_mem.c
+++ b/scst/src/scst_mem.c
@@ -275,14 +275,14 @@ static int __sgv_shrink(int nr, int min_interval, int *out_freed)
 	while (prev_nr > nr && nr > 0) {
 		prev_nr = nr;
 
-		mutex_lock(&sgv_pools_mutex);
-		list_for_each_entry(pool, &sgv_pools_list,
-				    sgv_pools_list_entry) {
+		rcu_read_lock();
+		list_for_each_entry_rcu(pool, &sgv_pools_list,
+					sgv_pools_list_entry) {
 			if (pool->cached_entries)
 				nr = sgv_shrink_pool(pool, nr, min_interval,
 						     cur_time, out_freed);
                 }
-		mutex_unlock(&sgv_pools_mutex);
+		rcu_read_unlock();
 	}
 
 	TRACE_EXIT_RES(nr);
@@ -1468,6 +1468,8 @@ out_del:
 	spin_lock_bh(&sgv_pools_lock);
 	list_del(&pool->sgv_pools_list_entry);
 	spin_unlock_bh(&sgv_pools_lock);
+
+	synchronize_rcu();
 #endif
 
 out_free:
@@ -1546,6 +1548,8 @@ static void sgv_pool_destroy(struct sgv_pool *pool)
 	spin_unlock_bh(&sgv_pools_lock);
 	mutex_unlock(&sgv_pools_mutex);
 
+	synchronize_rcu();
+
 #ifndef CONFIG_SCST_PROC
 	scst_sgv_sysfs_del(pool);
 #endif