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nvme: only call synchronize_srcu when clearing current path

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The function nmve_mpath_clear_current_path returns true if the current
path has changed. In this case we have to wait for all concurrent
submissions to finish. But if we didn't change the current path, there
is no point in waiting for another RCU period to finish.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Daniel Wagner 2021-09-01 11:25:24 +02:00 committed by Christoph Hellwig
parent b58da2d270
commit 041bd1a1fc
1 changed files with 6 additions and 3 deletions
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9
drivers/nvme/host/core.c
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@ -3838,9 +3838,12 @@ static void nvme_ns_remove(struct nvme_ns *ns)
list_del_rcu(&ns->siblings);
mutex_unlock(&ns->ctrl->subsys->lock);
synchronize_rcu(); /* guarantee not available in head->list */
nvme_mpath_clear_current_path(ns);
synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */
/* guarantee not available in head->list */
synchronize_rcu();
/* wait for concurrent submissions */
if (nvme_mpath_clear_current_path(ns))
synchronize_srcu(&ns->head->srcu);
if (!nvme_ns_head_multipath(ns->head))
nvme_cdev_del(&ns->cdev, &ns->cdev_device);