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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2018-06-01 09:11:20 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-06-08 12:51:10 -0600 |
| commit | 12a0b662210702c6b0ce9f66f0c177ff1dea99cb (patch) | |
| tree | 1ec47a51a7aa9cfdd5acc59f1970b2523fb76ae4 | |
| parent | f39ae4719b1c33d048aa4d3c284d82ecf252742b (diff) | |
| download | linux-12a0b662210702c6b0ce9f66f0c177ff1dea99cb.tar.gz | |
nvme: don't hold nvmf_transports_rwsem for more than transport lookups
Only take nvmf_transports_rwsem when doing a lookup of registered
transports, so that a blocking ->create_ctrl doesn't prevent other
actions on /dev/nvme-fabrics.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
[hch: increased lock hold time a bit to be safe, added a comment
and updated the changelog]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/nvme/host/fabrics.c | 3 | ||||
| -rw-r--r-- | drivers/nvme/host/fabrics.h | 3 |
2 files changed, 5 insertions, 1 deletions
diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c index 5f5f7067c41d63..fa32c1216409a3 100644 --- a/drivers/nvme/host/fabrics.c +++ b/drivers/nvme/host/fabrics.c @@ -952,6 +952,7 @@ nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) ret = -EBUSY; goto out_unlock; } + up_read(&nvmf_transports_rwsem); ret = nvmf_check_required_opts(opts, ops->required_opts); if (ret) @@ -968,11 +969,11 @@ nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) } module_put(ops->module); - up_read(&nvmf_transports_rwsem); return ctrl; out_module_put: module_put(ops->module); + goto out_free_opts; out_unlock: up_read(&nvmf_transports_rwsem); out_free_opts: diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h index 0cf0460a5c921f..7491a0bbf711d6 100644 --- a/drivers/nvme/host/fabrics.h +++ b/drivers/nvme/host/fabrics.h @@ -124,6 +124,9 @@ struct nvmf_ctrl_options { * 1. At minimum, 'required_opts' and 'allowed_opts' should * be set to the same enum parsing options defined earlier. * 2. create_ctrl() must be defined (even if it does nothing) + * 3. struct nvmf_transport_ops must be statically allocated in the + * modules .bss section so that a pure module_get on @module + * prevents the memory from beeing freed. */ struct nvmf_transport_ops { struct list_head entry; |