nvme-fabrics: Allow 0 as KATO value

Currently, driver code allows user to set 0 as KATO
(Keep Alive TimeOut), but this is not being respected.
This patch enforces the expected behavior.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 4730775..555c976 100644 (file)
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -565,6 +565,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
        opts->queue_size = NVMF_DEF_QUEUE_SIZE;
        opts->nr_io_queues = num_online_cpus();
        opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
+       opts->kato = NVME_DEFAULT_KATO;
 
        options = o = kstrdup(buf, GFP_KERNEL);
        if (!options)
@@ -655,21 +656,22 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
                                goto out;
                        }
 
-                       if (opts->discovery_nqn) {
-                               pr_err("Discovery controllers cannot accept keep_alive_tmo != 0\n");
-                               ret = -EINVAL;
-                               goto out;
-                       }
-
                        if (token < 0) {
                                pr_err("Invalid keep_alive_tmo %d\n", token);
                                ret = -EINVAL;
                                goto out;
-                       } else if (token == 0) {
+                       } else if (token == 0 && !opts->discovery_nqn) {
                                /* Allowed for debug */
                                pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
                        }
                        opts->kato = token;
+
+                       if (opts->discovery_nqn && opts->kato) {
+                               pr_err("Discovery controllers cannot accept KATO != 0\n");
+                               ret = -EINVAL;
+                               goto out;
+                       }
+
                        break;
                case NVMF_OPT_CTRL_LOSS_TMO:
                        if (match_int(args, &token)) {
@@ -762,8 +764,6 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
        uuid_copy(&opts->host->id, &hostid);
 
 out:
-       if (!opts->discovery_nqn && !opts->kato)
-               opts->kato = NVME_DEFAULT_KATO;
        kfree(options);
        return ret;
 }