diff options
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_device.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 16a701fed66b..f10dfe7b1d54 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -51,6 +51,7 @@ DEFINE_MUTEX(g_device_mutex); LIST_HEAD(g_device_list); +static DEFINE_IDR(devices_idr); static struct se_hba *lun0_hba; /* not static, needed by tpg.c */ @@ -882,7 +883,7 @@ EXPORT_SYMBOL(target_to_linux_sector); int target_configure_device(struct se_device *dev) { struct se_hba *hba = dev->se_hba; - int ret; + int ret, id; if (dev->dev_flags & DF_CONFIGURED) { pr_err("se_dev->se_dev_ptr already set for storage" @@ -890,9 +891,26 @@ int target_configure_device(struct se_device *dev) return -EEXIST; } + /* + * Add early so modules like tcmu can use during its + * configuration. + */ + mutex_lock(&g_device_mutex); + /* + * Use cyclic to try and avoid collisions with devices + * that were recently removed. + */ + id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL); + mutex_unlock(&g_device_mutex); + if (id < 0) { + ret = -ENOMEM; + goto out; + } + dev->dev_index = id; + ret = dev->transport->configure_device(dev); if (ret) - goto out; + goto out_free_index; /* * XXX: there is not much point to have two different values here.. */ @@ -907,12 +925,11 @@ int target_configure_device(struct se_device *dev) dev->dev_attrib.hw_block_size); dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors; - dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); dev->creation_time = get_jiffies_64(); ret = core_setup_alua(dev); if (ret) - goto out; + goto out_free_index; /* * Startup the struct se_device processing thread @@ -960,6 +977,10 @@ int target_configure_device(struct se_device *dev) out_free_alua: core_alua_free_lu_gp_mem(dev); +out_free_index: + mutex_lock(&g_device_mutex); + idr_remove(&devices_idr, dev->dev_index); + mutex_unlock(&g_device_mutex); out: se_release_vpd_for_dev(dev); return ret; @@ -977,6 +998,7 @@ void target_free_device(struct se_device *dev) dev->transport->destroy_device(dev); mutex_lock(&g_device_mutex); + idr_remove(&devices_idr, dev->dev_index); list_del(&dev->g_dev_node); mutex_unlock(&g_device_mutex); |