smb: client: propagate error from cifs_construct_tcon()

Propagate error from cifs_construct_tcon() in cifs_sb_tlink() instead of
always returning -EACCES.
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/connect.c

@@ -4211,9 +4211,9 @@ tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
 struct tcon_link *
 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
 {
-	int ret;
-	kuid_t fsuid = current_fsuid();
 	struct tcon_link *tlink, *newtlink;
+	kuid_t fsuid = current_fsuid();
+	int err;
 
 	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
 		return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
@@ -4248,9 +4248,9 @@ cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
 		spin_unlock(&cifs_sb->tlink_tree_lock);
 	} else {
 wait_for_construction:
-		ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
+		err = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
 				  TASK_INTERRUPTIBLE);
-		if (ret) {
+		if (err) {
 			cifs_put_tlink(tlink);
 			return ERR_PTR(-ERESTARTSYS);
 		}
@@ -4261,8 +4261,9 @@ cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
 
 		/* return error if we tried this already recently */
 		if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
+			err = PTR_ERR(tlink->tl_tcon);
 			cifs_put_tlink(tlink);
-			return ERR_PTR(-EACCES);
+			return ERR_PTR(err);
 		}
 
 		if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
@@ -4274,8 +4275,11 @@ cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
 	wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
 
 	if (IS_ERR(tlink->tl_tcon)) {
+		err = PTR_ERR(tlink->tl_tcon);
+		if (err == -ENOKEY)
+			err = -EACCES;
 		cifs_put_tlink(tlink);
-		return ERR_PTR(-EACCES);
+		return ERR_PTR(err);
 	}
 
 	return tlink;