2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 #include <linux/module.h>
14 #include <linux/device.h>
18 static int nd_region_probe(struct device
*dev
)
21 struct nd_region_namespaces
*num_ns
;
22 struct nd_region
*nd_region
= to_nd_region(dev
);
23 int rc
= nd_region_register_namespaces(nd_region
, &err
);
25 num_ns
= devm_kzalloc(dev
, sizeof(*num_ns
), GFP_KERNEL
);
33 num_ns
->count
= rc
+ err
;
34 dev_set_drvdata(dev
, num_ns
);
43 * Given multiple namespaces per region, we do not want to
44 * disable all the successfully registered peer namespaces upon
45 * a single registration failure. If userspace is missing a
46 * namespace that it expects it can disable/re-enable the region
47 * to retry discovery after correcting the failure.
48 * <regionX>/namespaces returns the current
49 * "<async-registered>/<total>" namespace count.
51 dev_err(dev
, "failed to register %d namespace%s, continuing...\n",
52 err
, err
== 1 ? "" : "s");
56 static int child_unregister(struct device
*dev
, void *data
)
58 nd_device_unregister(dev
, ND_SYNC
);
62 static int nd_region_remove(struct device
*dev
)
64 /* flush attribute readers and disable */
66 dev_set_drvdata(dev
, NULL
);
67 nvdimm_bus_unlock(dev
);
69 device_for_each_child(dev
, NULL
, child_unregister
);
73 static struct nd_device_driver nd_region_driver
= {
74 .probe
= nd_region_probe
,
75 .remove
= nd_region_remove
,
79 .type
= ND_DRIVER_REGION_BLK
| ND_DRIVER_REGION_PMEM
,
82 int __init
nd_region_init(void)
84 return nd_driver_register(&nd_region_driver
);
87 void nd_region_exit(void)
89 driver_unregister(&nd_region_driver
.drv
);
92 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM
);
93 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK
);