diff options
| author | Luis Chamberlain <mcgrof@kernel.org> | 2021-10-16 01:52:08 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-10-20 19:16:03 +0200 |
| commit | 11384580e3322b41dbaa68dbcd949af875b8aa22 (patch) | |
| tree | ec096414fbb5b57d58c6c5b1095c9672b630b3cb /drivers/nvme | |
| parent | nvmet: use macro definitions for setting cmic value (diff) | |
| download | linux-11384580e3322b41dbaa68dbcd949af875b8aa22.tar.xz linux-11384580e3322b41dbaa68dbcd949af875b8aa22.zip | |
nvme-multipath: add error handling support for add_disk()
We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.
Since we now can tell for sure when a disk was added, move
setting the bit NVME_NSHEAD_DISK_LIVE only when we did
add the disk successfully.
Nothing to do here as the cleanup is done elsewhere. We take
care and use test_and_set_bit() because it is protects against
two nvme paths simultaneously calling device_add_disk() on the
same namespace head.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/multipath.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 22c6b64f4d93..bc1e7d8a2c0f 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -509,13 +509,23 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) static void nvme_mpath_set_live(struct nvme_ns *ns) { struct nvme_ns_head *head = ns->head; + int rc; if (!head->disk) return; + /* + * test_and_set_bit() is used because it is protecting against two nvme + * paths simultaneously calling device_add_disk() on the same namespace + * head. + */ if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { - device_add_disk(&head->subsys->dev, head->disk, - nvme_ns_id_attr_groups); + rc = device_add_disk(&head->subsys->dev, head->disk, + nvme_ns_id_attr_groups); + if (rc) { + clear_bit(NVME_NSHEAD_DISK_LIVE, &ns->flags); + return; + } nvme_add_ns_head_cdev(head); } |