diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-04-07 14:20:40 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-04-15 08:12:55 +0200 |
| commit | 871ca3ef132650b9b7777c2f2fd15b72c282d792 (patch) | |
| tree | 14933692068857d5a220c1b8d9964650dda92724 /drivers/nvme/host | |
| parent | nvme: move the ioctl code to a separate file (diff) | |
| download | linux-871ca3ef132650b9b7777c2f2fd15b72c282d792.tar.xz linux-871ca3ef132650b9b7777c2f2fd15b72c282d792.zip | |
nvme: factor out a nvme_tryget_ns_head helper
Add a helper to avoid opencoding ns_head->ref manipulations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Javier González <javier.gonz@samsung.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Diffstat (limited to 'drivers/nvme/host')
| -rw-r--r-- | drivers/nvme/host/core.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index b20ffa25f0f0..88ae847f99fa 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -549,6 +549,11 @@ static void nvme_free_ns_head(struct kref *ref) kfree(head); } +static bool nvme_tryget_ns_head(struct nvme_ns_head *head) +{ + return kref_get_unless_zero(&head->ref); +} + static void nvme_put_ns_head(struct nvme_ns_head *head) { kref_put(&head->ref, nvme_free_ns_head); @@ -1975,9 +1980,7 @@ static const struct block_device_operations nvme_bdev_ops = { #ifdef CONFIG_NVME_MULTIPATH static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) { - struct nvme_ns_head *head = bdev->bd_disk->private_data; - - if (!kref_get_unless_zero(&head->ref)) + if (!nvme_tryget_ns_head(bdev->bd_disk->private_data)) return -ENXIO; return 0; } @@ -3404,7 +3407,7 @@ static struct nvme_ns_head *nvme_find_ns_head(struct nvme_subsystem *subsys, lockdep_assert_held(&subsys->lock); list_for_each_entry(h, &subsys->nsheads, entry) { - if (h->ns_id == nsid && kref_get_unless_zero(&h->ref)) + if (h->ns_id == nsid && nvme_tryget_ns_head(h)) return h; } |