RDMA/core: Use simpler device_del() instead of device_unregister()

Instead of holding extra reference using get_device() that
device_unregister() releases, simplify it as below.

device_add() balances with device_del().  device_initialize() balances
with put_device(), always via ib_dealloc_device().

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 3325be4..46d237c 100644 (file)
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -369,6 +369,7 @@ void ib_dealloc_device(struct ib_device *device)
        WARN_ON(!xa_empty(&device->client_data));
        WARN_ON(refcount_read(&device->refcount));
        rdma_restrack_clean(device);
+       /* Balances with device_initialize */
        put_device(&device->dev);
 }
 EXPORT_SYMBOL(ib_dealloc_device);

diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index c756928..e04f111 100644 (file)
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -1351,15 +1351,12 @@ err:
 
 void ib_device_unregister_sysfs(struct ib_device *device)
 {
-       /* Hold device until ib_dealloc_device() */
-       get_device(&device->dev);
-
        free_port_list_attributes(device);
 
        if (device->hw_stats) {
                kfree(device->hw_stats);
                free_hsag(&device->dev.kobj, device->hw_stats_ag);
        }
-
-       device_unregister(&device->dev);
+       /* Balances with device_add */
+       device_del(&device->dev);
 }