1 files changed, 19 insertions, 21 deletions

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 6f2dd73128b0..f4e1cc1ece43 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -1590,18 +1590,13 @@ void r5l_quiesce(struct r5l_log *log, int quiesce)
 
 bool r5l_log_disk_error(struct r5conf *conf)
 {
-	struct r5l_log *log;
-	bool ret;
-	/* don't allow write if journal disk is missing */
-	rcu_read_lock();
-	log = rcu_dereference(conf->log);
+	struct r5l_log *log = conf->log;
 
+	/* don't allow write if journal disk is missing */
 	if (!log)
-		ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
+		return test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
 	else
-		ret = test_bit(Faulty, &log->rdev->flags);
-	rcu_read_unlock();
-	return ret;
+		return test_bit(Faulty, &log->rdev->flags);
 }
 
 #define R5L_RECOVERY_PAGE_POOL_SIZE 256
@@ -2534,12 +2529,13 @@ static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page)
 	struct r5conf *conf;
 	int ret;
 
-	spin_lock(&mddev->lock);
+	ret = mddev_lock(mddev);
+	if (ret)
+		return ret;
+
 	conf = mddev->private;
-	if (!conf || !conf->log) {
-		spin_unlock(&mddev->lock);
-		return 0;
-	}
+	if (!conf || !conf->log)
+		goto out_unlock;
 
 	switch (conf->log->r5c_journal_mode) {
 	case R5C_JOURNAL_MODE_WRITE_THROUGH:
@@ -2557,7 +2553,9 @@ static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page)
 	default:
 		ret = 0;
 	}
-	spin_unlock(&mddev->lock);
+
+out_unlock:
+	mddev_unlock(mddev);
 	return ret;
 }
 
@@ -2639,7 +2637,7 @@ int r5c_try_caching_write(struct r5conf *conf,
 	int i;
 	struct r5dev *dev;
 	int to_cache = 0;
-	void **pslot;
+	void __rcu **pslot;
 	sector_t tree_index;
 	int ret;
 	uintptr_t refcount;
@@ -2806,7 +2804,7 @@ void r5c_finish_stripe_write_out(struct r5conf *conf,
 	int i;
 	int do_wakeup = 0;
 	sector_t tree_index;
-	void **pslot;
+	void __rcu **pslot;
 	uintptr_t refcount;
 
 	if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags))
@@ -3145,7 +3143,7 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
 	spin_lock_init(&log->stripe_in_journal_lock);
 	atomic_set(&log->stripe_in_journal_count, 0);
 
-	rcu_assign_pointer(conf->log, log);
+	conf->log = log;
 
 	set_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
 	return 0;
@@ -3167,13 +3165,13 @@ void r5l_exit_log(struct r5conf *conf)
 {
 	struct r5l_log *log = conf->log;
 
-	conf->log = NULL;
-	synchronize_rcu();
-
 	/* Ensure disable_writeback_work wakes up and exits */
 	wake_up(&conf->mddev->sb_wait);
 	flush_work(&log->disable_writeback_work);
 	md_unregister_thread(&log->reclaim_thread);
+
+	conf->log = NULL;
+
 	mempool_exit(&log->meta_pool);
 	bioset_exit(&log->bs);
 	mempool_exit(&log->io_pool);