diff options
Diffstat (limited to 'drivers/block/nbd.c')
| -rw-r--r-- | drivers/block/nbd.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 7bdc7eb808ea..6463d0e8d0ce 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1473,7 +1473,17 @@ static int nbd_start_device(struct nbd_device *nbd) return -EINVAL; } - blk_mq_update_nr_hw_queues(&nbd->tag_set, config->num_connections); +retry: + mutex_unlock(&nbd->config_lock); + blk_mq_update_nr_hw_queues(&nbd->tag_set, num_connections); + mutex_lock(&nbd->config_lock); + + /* if another code path updated nr_hw_queues, retry until succeed */ + if (num_connections != config->num_connections) { + num_connections = config->num_connections; + goto retry; + } + nbd->pid = task_pid_nr(current); nbd_parse_flags(nbd); @@ -2198,9 +2208,7 @@ again: goto out; } } - ret = nbd_start_device(nbd); - if (ret) - goto out; + if (info->attrs[NBD_ATTR_BACKEND_IDENTIFIER]) { nbd->backend = nla_strdup(info->attrs[NBD_ATTR_BACKEND_IDENTIFIER], GFP_KERNEL); @@ -2216,6 +2224,8 @@ again: goto out; } set_bit(NBD_RT_HAS_BACKEND_FILE, &config->runtime_flags); + + ret = nbd_start_device(nbd); out: mutex_unlock(&nbd->config_lock); if (!ret) { |