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| author | Christoph Hellwig <hch@lst.de> | 2019-05-17 02:47:33 -0700 |
|---|---|---|
| committer | Keith Busch <keith.busch@intel.com> | 2019-05-17 11:06:59 -0600 |
| commit | 100c815cbd56480b3e31518475b04719c363614a (patch) | |
| tree | a88268d32b052af56875655effd26ee1b34ba41b | |
| parent | 6fa0321a96043b5a983bbefa785859d664645840 (diff) | |
| download | linux-stable-100c815cbd56480b3e31518475b04719c363614a.tar.gz linux-stable-100c815cbd56480b3e31518475b04719c363614a.tar.bz2 linux-stable-100c815cbd56480b3e31518475b04719c363614a.zip | |
nvme: fix srcu locking on error return in nvme_get_ns_from_disk
If we can't get a namespace don't leak the SRCU lock. nvme_ioctl was
working around this, but nvme_pr_command wasn't handling this properly.
Just do what callers would usually expect.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
| -rw-r--r-- | drivers/nvme/host/core.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 308b9ce820cd..421bffd95aee 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1361,9 +1361,14 @@ static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, { #ifdef CONFIG_NVME_MULTIPATH if (disk->fops == &nvme_ns_head_ops) { + struct nvme_ns *ns; + *head = disk->private_data; *srcu_idx = srcu_read_lock(&(*head)->srcu); - return nvme_find_path(*head); + ns = nvme_find_path(*head); + if (!ns) + srcu_read_unlock(&(*head)->srcu, *srcu_idx); + return ns; } #endif *head = NULL; @@ -1410,9 +1415,9 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); if (unlikely(!ns)) - ret = -EWOULDBLOCK; - else - ret = nvme_ns_ioctl(ns, cmd, arg); + return -EWOULDBLOCK; + + ret = nvme_ns_ioctl(ns, cmd, arg); nvme_put_ns_from_disk(head, srcu_idx); return ret; } |