Merge tag 'dm-4.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - a fix for a race in .request_fn request-based DM request handling vs
   DM device destruction

 - an RCU fix for dm-crypt's kernel keyring support that was included in
   4.10-rc1

 - a -Wbool-operation warning fix for DM multipath

* tag 'dm-4.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm crypt: replace RCU read-side section with rwsem
  dm rq: cope with DM device destruction while in dm_old_request_fn()
  dm mpath: cleanup -Wbool-operation warning in choose_pgpath()

Author: torvalds

drivers/md/dm-crypt.c

@@ -1534,26 +1534,26 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
 		return PTR_ERR(key);
 	}
 
-	rcu_read_lock();
+	down_read(&key->sem);
 
 	ukp = user_key_payload(key);
 	if (!ukp) {
-		rcu_read_unlock();
+		up_read(&key->sem);
 		key_put(key);
 		kzfree(new_key_string);
 		return -EKEYREVOKED;
 	}
 
 	if (cc->key_size != ukp->datalen) {
-		rcu_read_unlock();
+		up_read(&key->sem);
 		key_put(key);
 		kzfree(new_key_string);
 		return -EINVAL;
 	}
 
 	memcpy(cc->key, ukp->data, cc->key_size);
 
-	rcu_read_unlock();
+	up_read(&key->sem);
 	key_put(key);
 
 	/* clear the flag since following operations may invalidate previously valid key */

drivers/md/dm-mpath.c

@@ -427,7 +427,7 @@ static struct pgpath *choose_pgpath(struct multipath *m, size_t nr_bytes)
 	unsigned long flags;
 	struct priority_group *pg;
 	struct pgpath *pgpath;
-	bool bypassed = true;
+	unsigned bypassed = 1;
 
 	if (!atomic_read(&m->nr_valid_paths)) {
 		clear_bit(MPATHF_QUEUE_IO, &m->flags);
@@ -466,7 +466,7 @@ static struct pgpath *choose_pgpath(struct multipath *m, size_t nr_bytes)
 	 */
 	do {
 		list_for_each_entry(pg, &m->priority_groups, list) {
-			if (pg->bypassed == bypassed)
+			if (pg->bypassed == !!bypassed)
 				continue;
 			pgpath = choose_path_in_pg(m, pg, nr_bytes);
 			if (!IS_ERR_OR_NULL(pgpath)) {

drivers/md/dm-rq.c

@@ -779,6 +779,10 @@ static void dm_old_request_fn(struct request_queue *q)
 		int srcu_idx;
 		struct dm_table *map = dm_get_live_table(md, &srcu_idx);
 
+		if (unlikely(!map)) {
+			dm_put_live_table(md, srcu_idx);
+			return;
+		}
 		ti = dm_table_find_target(map, pos);
 		dm_put_live_table(md, srcu_idx);
 	}