nvme: fix controller instance leak

[ Upstream commit 192f6c29bb28bfd0a17e6ad331d09f1ec84143d0 ]

If the driver has to unbind from the controller for an early failure
before the subsystem has been set up, there won't be a subsystem holding
the controller's instance, so the controller needs to free its own
instance in this case.

Fixes: 733e4b69d508d ("nvme: Assign subsys instance from first ctrl")
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ff5681da8780dd896b9509cdd1bae57e1929ebf7..3cb017fa3a790fc843802bcdc09fa95f6a3e5892 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4012,7 +4012,7 @@ static void nvme_free_ctrl(struct device *dev)
                container_of(dev, struct nvme_ctrl, ctrl_device);
        struct nvme_subsystem *subsys = ctrl->subsys;
 
-       if (subsys && ctrl->instance != subsys->instance)
+       if (!subsys || ctrl->instance != subsys->instance)
                ida_simple_remove(&nvme_instance_ida, ctrl->instance);
 
        kfree(ctrl->effects);