1 files changed, 26 insertions, 18 deletions

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 0b7406ac8ce1..f1c86d938502 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -23,7 +23,7 @@
 #include <linux/types.h>
 #include "md.h"
 #include "raid5.h"
-#include "bitmap.h"
+#include "md-bitmap.h"
 #include "raid5-log.h"
 
 /*
@@ -539,7 +539,7 @@ static void r5l_log_run_stripes(struct r5l_log *log)
 {
 	struct r5l_io_unit *io, *next;
 
-	assert_spin_locked(&log->io_list_lock);
+	lockdep_assert_held(&log->io_list_lock);
 
 	list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) {
 		/* don't change list order */
@@ -555,7 +555,7 @@ static void r5l_move_to_end_ios(struct r5l_log *log)
 {
 	struct r5l_io_unit *io, *next;
 
-	assert_spin_locked(&log->io_list_lock);
+	lockdep_assert_held(&log->io_list_lock);
 
 	list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) {
 		/* don't change list order */
@@ -693,6 +693,8 @@ static void r5c_disable_writeback_async(struct work_struct *work)
 	struct r5l_log *log = container_of(work, struct r5l_log,
 					   disable_writeback_work);
 	struct mddev *mddev = log->rdev->mddev;
+	struct r5conf *conf = mddev->private;
+	int locked = 0;
 
 	if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH)
 		return;
@@ -701,11 +703,15 @@ static void r5c_disable_writeback_async(struct work_struct *work)
 
 	/* wait superblock change before suspend */
 	wait_event(mddev->sb_wait,
-		   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
-
-	mddev_suspend(mddev);
-	log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
-	mddev_resume(mddev);
+		   conf->log == NULL ||
+		   (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) &&
+		    (locked = mddev_trylock(mddev))));
+	if (locked) {
+		mddev_suspend(mddev);
+		log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
+		mddev_resume(mddev);
+		mddev_unlock(mddev);
+	}
 }
 
 static void r5l_submit_current_io(struct r5l_log *log)
@@ -1194,7 +1200,7 @@ static void r5l_run_no_mem_stripe(struct r5l_log *log)
 {
 	struct stripe_head *sh;
 
-	assert_spin_locked(&log->io_list_lock);
+	lockdep_assert_held(&log->io_list_lock);
 
 	if (!list_empty(&log->no_mem_stripes)) {
 		sh = list_first_entry(&log->no_mem_stripes,
@@ -1210,7 +1216,7 @@ static bool r5l_complete_finished_ios(struct r5l_log *log)
 	struct r5l_io_unit *io, *next;
 	bool found = false;
 
-	assert_spin_locked(&log->io_list_lock);
+	lockdep_assert_held(&log->io_list_lock);
 
 	list_for_each_entry_safe(io, next, &log->finished_ios, log_sibling) {
 		/* don't change list order */
@@ -1382,7 +1388,7 @@ static void r5c_flush_stripe(struct r5conf *conf, struct stripe_head *sh)
 	 * raid5_release_stripe() while holding conf->device_lock
 	 */
 	BUG_ON(test_bit(STRIPE_ON_RELEASE_LIST, &sh->state));
-	assert_spin_locked(&conf->device_lock);
+	lockdep_assert_held(&conf->device_lock);
 
 	list_del_init(&sh->lru);
 	atomic_inc(&sh->count);
@@ -1409,7 +1415,7 @@ void r5c_flush_cache(struct r5conf *conf, int num)
 	int count;
 	struct stripe_head *sh, *next;
 
-	assert_spin_locked(&conf->device_lock);
+	lockdep_assert_held(&conf->device_lock);
 	if (!conf->log)
 		return;
 
@@ -1583,21 +1589,21 @@ void r5l_wake_reclaim(struct r5l_log *log, sector_t space)
 	md_wakeup_thread(log->reclaim_thread);
 }
 
-void r5l_quiesce(struct r5l_log *log, int state)
+void r5l_quiesce(struct r5l_log *log, int quiesce)
 {
 	struct mddev *mddev;
-	if (!log || state == 2)
+	if (!log)
 		return;
-	if (state == 0)
-		kthread_unpark(log->reclaim_thread->tsk);
-	else if (state == 1) {
+
+	if (quiesce) {
 		/* make sure r5l_write_super_and_discard_space exits */
 		mddev = log->rdev->mddev;
 		wake_up(&mddev->sb_wait);
 		kthread_park(log->reclaim_thread->tsk);
 		r5l_wake_reclaim(log, MaxSector);
 		r5l_do_reclaim(log);
-	}
+	} else
+		kthread_unpark(log->reclaim_thread->tsk);
 }
 
 bool r5l_log_disk_error(struct r5conf *conf)
@@ -3165,6 +3171,8 @@ void r5l_exit_log(struct r5conf *conf)
 	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);
 	mempool_destroy(log->meta_pool);