Now that we are protected against lookup vs free races for the namespace
by using kref_get_unless_zero we don't need the hack of NULLing out the
disk private data during removal.
Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Sagi Grimberg <s...@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>
---
drivers/nvme/host/core.c | 40 ++++++++++------------------------------
1 file changed, 10 insertions(+), 30 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1d931deac83b..9f8ae15c9fe8 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -253,12 +253,6 @@ static void nvme_free_ns(struct kref *kref)
if (ns->ndev)
nvme_nvm_unregister(ns);
- if (ns->disk) {
- spin_lock(&dev_list_lock);
- ns->disk->private_data = NULL;
- spin_unlock(&dev_list_lock);
- }
-
put_disk(ns->disk);
ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
nvme_put_ctrl(ns->ctrl);
@@ -270,29 +264,6 @@ static void nvme_put_ns(struct nvme_ns *ns)
kref_put(&ns->kref, nvme_free_ns);
}
-static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
-{
- struct nvme_ns *ns;
-
- spin_lock(&dev_list_lock);
- ns = disk->private_data;
- if (ns) {
- if (!kref_get_unless_zero(&ns->kref))
- goto fail;
- if (!try_module_get(ns->ctrl->ops->module))
- goto fail_put_ns;
- }
- spin_unlock(&dev_list_lock);
-
- return ns;
-
-fail_put_ns:
- kref_put(&ns->kref, nvme_free_ns);
-fail:
- spin_unlock(&dev_list_lock);
- return NULL;
-}
-
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, unsigned int flags, int qid)
{
@@ -1056,7 +1027,16 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t
mode,
static int nvme_open(struct block_device *bdev, fmode_t mode)
{
- return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
+ struct nvme_ns *ns = bdev->bd_disk->private_data;
+
+ if (!kref_get_unless_zero(&ns->kref))
+ return -ENXIO;
+ if (!try_module_get(ns->ctrl->ops->module)) {
+ kref_put(&ns->kref, nvme_free_ns);
+ return -ENXIO;
+ }
+
+ return 0;
}
static void nvme_release(struct gendisk *disk, fmode_t mode)
--
2.14.2
