linux/net/wimax/stack.c

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/*
* Linux WiMAX
* Initialization, addition and removal of wimax devices
*
*
* Copyright (C) 2005-2006 Intel Corporation <linux-wimax@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* This implements:
*
* - basic life cycle of 'struct wimax_dev' [wimax_dev_*()]; on
* addition/registration initialize all subfields and allocate
* generic netlink resources for user space communication. On
* removal/unregistration, undo all that.
*
* - device state machine [wimax_state_change()] and support to send
* reports to user space when the state changes
* [wimax_gnl_re_state_change*()].
*
* See include/net/wimax.h for rationales and design.
*
* ROADMAP
*
* [__]wimax_state_change() Called by drivers to update device's state
* wimax_gnl_re_state_change_alloc()
* wimax_gnl_re_state_change_send()
*
* wimax_dev_init() Init a device
* wimax_dev_add() Register
* wimax_rfkill_add()
* wimax_gnl_add() Register all the generic netlink resources.
* wimax_id_table_add()
* wimax_dev_rm() Unregister
* wimax_id_table_rm()
* wimax_gnl_rm()
* wimax_rfkill_rm()
*/
#include <linux/device.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/gfp.h>
#include <net/genetlink.h>
#include <linux/netdevice.h>
#include <linux/wimax.h>
#include <linux/module.h>
#include "wimax-internal.h"
#define D_SUBMODULE stack
#include "debug-levels.h"
static char wimax_debug_params[128];
module_param_string(debug, wimax_debug_params, sizeof(wimax_debug_params),
0644);
MODULE_PARM_DESC(debug,
"String of space-separated NAME:VALUE pairs, where NAMEs "
"are the different debug submodules and VALUE are the "
"initial debug value to set.");
/*
* Authoritative source for the RE_STATE_CHANGE attribute policy
*
* We don't really use it here, but /me likes to keep the definition
* close to where the data is generated.
*/
/*
static const struct nla_policy wimax_gnl_re_status_change[WIMAX_GNL_ATTR_MAX + 1] = {
[WIMAX_GNL_STCH_STATE_OLD] = { .type = NLA_U8 },
[WIMAX_GNL_STCH_STATE_NEW] = { .type = NLA_U8 },
};
*/
/*
* Allocate a Report State Change message
*
* @header: save it, you need it for _send()
*
* Creates and fills a basic state change message; different code
* paths can then add more attributes to the message as needed.
*
* Use wimax_gnl_re_state_change_send() to send the returned skb.
*
* Returns: skb with the genl message if ok, IS_ERR() ptr on error
* with an errno code.
*/
static
struct sk_buff *wimax_gnl_re_state_change_alloc(
struct wimax_dev *wimax_dev,
enum wimax_st new_state, enum wimax_st old_state,
void **header)
{
int result;
struct device *dev = wimax_dev_to_dev(wimax_dev);
void *data;
struct sk_buff *report_skb;
d_fnstart(3, dev, "(wimax_dev %p new_state %u old_state %u)\n",
wimax_dev, new_state, old_state);
result = -ENOMEM;
report_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (report_skb == NULL) {
dev_err(dev, "RE_STCH: can't create message\n");
goto error_new;
}
/* FIXME: sending a group ID as the seq is wrong */
data = genlmsg_put(report_skb, 0, wimax_gnl_family.mcgrp_offset,
&wimax_gnl_family, 0, WIMAX_GNL_RE_STATE_CHANGE);
if (data == NULL) {
dev_err(dev, "RE_STCH: can't put data into message\n");
goto error_put;
}
*header = data;
result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_OLD, old_state);
if (result < 0) {
dev_err(dev, "RE_STCH: Error adding OLD attr: %d\n", result);
goto error_put;
}
result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_NEW, new_state);
if (result < 0) {
dev_err(dev, "RE_STCH: Error adding NEW attr: %d\n", result);
goto error_put;
}
result = nla_put_u32(report_skb, WIMAX_GNL_STCH_IFIDX,
wimax_dev->net_dev->ifindex);
if (result < 0) {
dev_err(dev, "RE_STCH: Error adding IFINDEX attribute\n");
goto error_put;
}
d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %p\n",
wimax_dev, new_state, old_state, report_skb);
return report_skb;
error_put:
nlmsg_free(report_skb);
error_new:
d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %d\n",
wimax_dev, new_state, old_state, result);
return ERR_PTR(result);
}
/*
* Send a Report State Change message (as created with _alloc).
*
* @report_skb: as returned by wimax_gnl_re_state_change_alloc()
* @header: as returned by wimax_gnl_re_state_change_alloc()
*
* Returns: 0 if ok, < 0 errno code on error.
*
* If the message is NULL, pretend it didn't happen.
*/
static
int wimax_gnl_re_state_change_send(
struct wimax_dev *wimax_dev, struct sk_buff *report_skb,
void *header)
{
int result = 0;
struct device *dev = wimax_dev_to_dev(wimax_dev);
d_fnstart(3, dev, "(wimax_dev %p report_skb %p)\n",
wimax_dev, report_skb);
netlink: change return-value logic of netlink_broadcast() Currently, netlink_broadcast() reports errors to the caller if no messages at all were delivered: 1) If, at least, one message has been delivered correctly, returns 0. 2) Otherwise, if no messages at all were delivered due to skb_clone() failure, return -ENOBUFS. 3) Otherwise, if there are no listeners, return -ESRCH. With this patch, the caller knows if the delivery of any of the messages to the listeners have failed: 1) If it fails to deliver any message (for whatever reason), return -ENOBUFS. 2) Otherwise, if all messages were delivered OK, returns 0. 3) Otherwise, if no listeners, return -ESRCH. In the current ctnetlink code and in Netfilter in general, we can add reliable logging and connection tracking event delivery by dropping the packets whose events were not successfully delivered over Netlink. Of course, this option would be settable via /proc as this approach reduces performance (in terms of filtered connections per seconds by a stateful firewall) but providing reliable logging and event delivery (for conntrackd) in return. This patch also changes some clients of netlink_broadcast() that may report ENOBUFS errors via printk. This error handling is not of any help. Instead, the userspace daemons that are listening to those netlink messages should resync themselves with the kernel-side if they hit ENOBUFS. BTW, netlink_broadcast() clients include those that call cn_netlink_send(), nlmsg_multicast() and genlmsg_multicast() since they internally call netlink_broadcast() and return its error value. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-06 07:56:36 +00:00
if (report_skb == NULL) {
result = -ENOMEM;
goto out;
}
netlink: change return-value logic of netlink_broadcast() Currently, netlink_broadcast() reports errors to the caller if no messages at all were delivered: 1) If, at least, one message has been delivered correctly, returns 0. 2) Otherwise, if no messages at all were delivered due to skb_clone() failure, return -ENOBUFS. 3) Otherwise, if there are no listeners, return -ESRCH. With this patch, the caller knows if the delivery of any of the messages to the listeners have failed: 1) If it fails to deliver any message (for whatever reason), return -ENOBUFS. 2) Otherwise, if all messages were delivered OK, returns 0. 3) Otherwise, if no listeners, return -ESRCH. In the current ctnetlink code and in Netfilter in general, we can add reliable logging and connection tracking event delivery by dropping the packets whose events were not successfully delivered over Netlink. Of course, this option would be settable via /proc as this approach reduces performance (in terms of filtered connections per seconds by a stateful firewall) but providing reliable logging and event delivery (for conntrackd) in return. This patch also changes some clients of netlink_broadcast() that may report ENOBUFS errors via printk. This error handling is not of any help. Instead, the userspace daemons that are listening to those netlink messages should resync themselves with the kernel-side if they hit ENOBUFS. BTW, netlink_broadcast() clients include those that call cn_netlink_send(), nlmsg_multicast() and genlmsg_multicast() since they internally call netlink_broadcast() and return its error value. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-06 07:56:36 +00:00
genlmsg_end(report_skb, header);
genlmsg_multicast(&wimax_gnl_family, report_skb, 0, 0, GFP_KERNEL);
out:
d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
wimax_dev, report_skb, result);
return result;
}
static
void __check_new_state(enum wimax_st old_state, enum wimax_st new_state,
unsigned int allowed_states_bm)
{
if (WARN_ON(((1 << new_state) & allowed_states_bm) == 0)) {
pr_err("SW BUG! Forbidden state change %u -> %u\n",
old_state, new_state);
}
}
/*
* Set the current state of a WiMAX device [unlocking version of
* wimax_state_change().
*/
void __wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
{
struct device *dev = wimax_dev_to_dev(wimax_dev);
enum wimax_st old_state = wimax_dev->state;
struct sk_buff *stch_skb;
void *header;
d_fnstart(3, dev, "(wimax_dev %p new_state %u [old %u])\n",
wimax_dev, new_state, old_state);
if (WARN_ON(new_state >= __WIMAX_ST_INVALID)) {
dev_err(dev, "SW BUG: requesting invalid state %u\n",
new_state);
goto out;
}
if (old_state == new_state)
goto out;
header = NULL; /* gcc complains? can't grok why */
stch_skb = wimax_gnl_re_state_change_alloc(
wimax_dev, new_state, old_state, &header);
/* Verify the state transition and do exit-from-state actions */
switch (old_state) {
case __WIMAX_ST_NULL:
__check_new_state(old_state, new_state,
1 << WIMAX_ST_DOWN);
break;
case WIMAX_ST_DOWN:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_UNINITIALIZED
| 1 << WIMAX_ST_RADIO_OFF);
break;
case __WIMAX_ST_QUIESCING:
__check_new_state(old_state, new_state, 1 << WIMAX_ST_DOWN);
break;
case WIMAX_ST_UNINITIALIZED:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_RADIO_OFF);
break;
case WIMAX_ST_RADIO_OFF:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_READY);
break;
case WIMAX_ST_READY:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_RADIO_OFF
| 1 << WIMAX_ST_SCANNING
| 1 << WIMAX_ST_CONNECTING
| 1 << WIMAX_ST_CONNECTED);
break;
case WIMAX_ST_SCANNING:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_RADIO_OFF
| 1 << WIMAX_ST_READY
| 1 << WIMAX_ST_CONNECTING
| 1 << WIMAX_ST_CONNECTED);
break;
case WIMAX_ST_CONNECTING:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_RADIO_OFF
| 1 << WIMAX_ST_READY
| 1 << WIMAX_ST_SCANNING
| 1 << WIMAX_ST_CONNECTED);
break;
case WIMAX_ST_CONNECTED:
__check_new_state(old_state, new_state,
1 << __WIMAX_ST_QUIESCING
| 1 << WIMAX_ST_RADIO_OFF
| 1 << WIMAX_ST_READY);
netif_tx_disable(wimax_dev->net_dev);
netif_carrier_off(wimax_dev->net_dev);
break;
case __WIMAX_ST_INVALID:
default:
dev_err(dev, "SW BUG: wimax_dev %p is in unknown state %u\n",
wimax_dev, wimax_dev->state);
WARN_ON(1);
goto out;
}
/* Execute the actions of entry to the new state */
switch (new_state) {
case __WIMAX_ST_NULL:
dev_err(dev, "SW BUG: wimax_dev %p entering NULL state "
"from %u\n", wimax_dev, wimax_dev->state);
WARN_ON(1); /* Nobody can enter this state */
break;
case WIMAX_ST_DOWN:
break;
case __WIMAX_ST_QUIESCING:
break;
case WIMAX_ST_UNINITIALIZED:
break;
case WIMAX_ST_RADIO_OFF:
break;
case WIMAX_ST_READY:
break;
case WIMAX_ST_SCANNING:
break;
case WIMAX_ST_CONNECTING:
break;
case WIMAX_ST_CONNECTED:
netif_carrier_on(wimax_dev->net_dev);
netif_wake_queue(wimax_dev->net_dev);
break;
case __WIMAX_ST_INVALID:
default:
BUG();
}
__wimax_state_set(wimax_dev, new_state);
if (!IS_ERR(stch_skb))
wimax_gnl_re_state_change_send(wimax_dev, stch_skb, header);
out:
d_fnend(3, dev, "(wimax_dev %p new_state %u [old %u]) = void\n",
wimax_dev, new_state, old_state);
}
/**
* wimax_state_change - Set the current state of a WiMAX device
*
* @wimax_dev: WiMAX device descriptor (properly referenced)
* @new_state: New state to switch to
*
* This implements the state changes for the wimax devices. It will
*
* - verify that the state transition is legal (for now it'll just
* print a warning if not) according to the table in
* linux/wimax.h's documentation for 'enum wimax_st'.
*
* - perform the actions needed for leaving the current state and
* whichever are needed for entering the new state.
*
* - issue a report to user space indicating the new state (and an
* optional payload with information about the new state).
*
* NOTE: @wimax_dev must be locked
*/
void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
{
/*
* A driver cannot take the wimax_dev out of the
* __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
* the wimax_dev's state is still NULL, we ignore any request
* to change its state because it means it hasn't been yet
* registered.
*
* There is no need to complain about it, as routines that
* call this might be shared from different code paths that
* are called before or after wimax_dev_add() has done its
* job.
*/
mutex_lock(&wimax_dev->mutex);
if (wimax_dev->state > __WIMAX_ST_NULL)
__wimax_state_change(wimax_dev, new_state);
mutex_unlock(&wimax_dev->mutex);
}
EXPORT_SYMBOL_GPL(wimax_state_change);
/**
* wimax_state_get() - Return the current state of a WiMAX device
*
* @wimax_dev: WiMAX device descriptor
*
* Returns: Current state of the device according to its driver.
*/
enum wimax_st wimax_state_get(struct wimax_dev *wimax_dev)
{
enum wimax_st state;
mutex_lock(&wimax_dev->mutex);
state = wimax_dev->state;
mutex_unlock(&wimax_dev->mutex);
return state;
}
EXPORT_SYMBOL_GPL(wimax_state_get);
/**
* wimax_dev_init - initialize a newly allocated instance
*
* @wimax_dev: WiMAX device descriptor to initialize.
*
* Initializes fields of a freshly allocated @wimax_dev instance. This
* function assumes that after allocation, the memory occupied by
* @wimax_dev was zeroed.
*/
void wimax_dev_init(struct wimax_dev *wimax_dev)
{
INIT_LIST_HEAD(&wimax_dev->id_table_node);
__wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
mutex_init(&wimax_dev->mutex);
mutex_init(&wimax_dev->mutex_reset);
}
EXPORT_SYMBOL_GPL(wimax_dev_init);
static const struct nla_policy wimax_gnl_policy[WIMAX_GNL_ATTR_MAX + 1] = {
[WIMAX_GNL_RESET_IFIDX] = { .type = NLA_U32, },
[WIMAX_GNL_RFKILL_IFIDX] = { .type = NLA_U32, },
[WIMAX_GNL_RFKILL_STATE] = {
.type = NLA_U32 /* enum wimax_rf_state */
},
[WIMAX_GNL_STGET_IFIDX] = { .type = NLA_U32, },
[WIMAX_GNL_MSG_IFIDX] = { .type = NLA_U32, },
[WIMAX_GNL_MSG_DATA] = {
.type = NLA_UNSPEC, /* libnl doesn't grok BINARY yet */
},
};
static const struct genl_ops wimax_gnl_ops[] = {
{
.cmd = WIMAX_GNL_OP_MSG_FROM_USER,
.flags = GENL_ADMIN_PERM,
.policy = wimax_gnl_policy,
.doit = wimax_gnl_doit_msg_from_user,
},
{
.cmd = WIMAX_GNL_OP_RESET,
.flags = GENL_ADMIN_PERM,
.policy = wimax_gnl_policy,
.doit = wimax_gnl_doit_reset,
},
{
.cmd = WIMAX_GNL_OP_RFKILL,
.flags = GENL_ADMIN_PERM,
.policy = wimax_gnl_policy,
.doit = wimax_gnl_doit_rfkill,
},
{
.cmd = WIMAX_GNL_OP_STATE_GET,
.flags = GENL_ADMIN_PERM,
.policy = wimax_gnl_policy,
.doit = wimax_gnl_doit_state_get,
},
};
static
size_t wimax_addr_scnprint(char *addr_str, size_t addr_str_size,
unsigned char *addr, size_t addr_len)
{
unsigned int cnt, total;
for (total = cnt = 0; cnt < addr_len; cnt++)
total += scnprintf(addr_str + total, addr_str_size - total,
"%02x%c", addr[cnt],
cnt == addr_len - 1 ? '\0' : ':');
return total;
}
/**
* wimax_dev_add - Register a new WiMAX device
*
* @wimax_dev: WiMAX device descriptor (as embedded in your @net_dev's
* priv data). You must have called wimax_dev_init() on it before.
*
* @net_dev: net device the @wimax_dev is associated with. The
* function expects SET_NETDEV_DEV() and register_netdev() were
* already called on it.
*
* Registers the new WiMAX device, sets up the user-kernel control
* interface (generic netlink) and common WiMAX infrastructure.
*
* Note that the parts that will allow interaction with user space are
* setup at the very end, when the rest is in place, as once that
* happens, the driver might get user space control requests via
* netlink or from debugfs that might translate into calls into
* wimax_dev->op_*().
*/
int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
{
int result;
struct device *dev = net_dev->dev.parent;
char addr_str[32];
d_fnstart(3, dev, "(wimax_dev %p net_dev %p)\n", wimax_dev, net_dev);
/* Do the RFKILL setup before locking, as RFKILL will call
* into our functions. */
wimax_dev->net_dev = net_dev;
result = wimax_rfkill_add(wimax_dev);
if (result < 0)
goto error_rfkill_add;
/* Set up user-space interaction */
mutex_lock(&wimax_dev->mutex);
wimax_id_table_add(wimax_dev);
result = wimax_debugfs_add(wimax_dev);
if (result < 0) {
dev_err(dev, "cannot initialize debugfs: %d\n",
result);
goto error_debugfs_add;
}
__wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
mutex_unlock(&wimax_dev->mutex);
wimax_addr_scnprint(addr_str, sizeof(addr_str),
net_dev->dev_addr, net_dev->addr_len);
dev_err(dev, "WiMAX interface %s (%s) ready\n",
net_dev->name, addr_str);
d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
return 0;
error_debugfs_add:
wimax_id_table_rm(wimax_dev);
mutex_unlock(&wimax_dev->mutex);
wimax_rfkill_rm(wimax_dev);
error_rfkill_add:
d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
wimax_dev, net_dev, result);
return result;
}
EXPORT_SYMBOL_GPL(wimax_dev_add);
/**
* wimax_dev_rm - Unregister an existing WiMAX device
*
* @wimax_dev: WiMAX device descriptor
*
* Unregisters a WiMAX device previously registered for use with
* wimax_add_rm().
*
* IMPORTANT! Must call before calling unregister_netdev().
*
* After this function returns, you will not get any more user space
* control requests (via netlink or debugfs) and thus to wimax_dev->ops.
*
* Reentrancy control is ensured by setting the state to
* %__WIMAX_ST_QUIESCING. rfkill operations coming through
* wimax_*rfkill*() will be stopped by the quiescing state; ops coming
* from the rfkill subsystem will be stopped by the support being
* removed by wimax_rfkill_rm().
*/
void wimax_dev_rm(struct wimax_dev *wimax_dev)
{
d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev);
mutex_lock(&wimax_dev->mutex);
__wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
wimax_debugfs_rm(wimax_dev);
wimax_id_table_rm(wimax_dev);
__wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
mutex_unlock(&wimax_dev->mutex);
wimax_rfkill_rm(wimax_dev);
d_fnend(3, NULL, "(wimax_dev %p) = void\n", wimax_dev);
}
EXPORT_SYMBOL_GPL(wimax_dev_rm);
/* Debug framework control of debug levels */
struct d_level D_LEVEL[] = {
D_SUBMODULE_DEFINE(debugfs),
D_SUBMODULE_DEFINE(id_table),
D_SUBMODULE_DEFINE(op_msg),
D_SUBMODULE_DEFINE(op_reset),
D_SUBMODULE_DEFINE(op_rfkill),
D_SUBMODULE_DEFINE(op_state_get),
D_SUBMODULE_DEFINE(stack),
};
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
struct genl_family wimax_gnl_family = {
.id = GENL_ID_GENERATE,
.name = "WiMAX",
.version = WIMAX_GNL_VERSION,
.hdrsize = 0,
.maxattr = WIMAX_GNL_ATTR_MAX,
};
static const struct genl_multicast_group wimax_gnl_mcgrps[] = {
{ .name = "msg", },
};
/* Shutdown the wimax stack */
static
int __init wimax_subsys_init(void)
{
int result;
d_fnstart(4, NULL, "()\n");
d_parse_params(D_LEVEL, D_LEVEL_SIZE, wimax_debug_params,
"wimax.debug");
snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
"WiMAX");
result = genl_register_family_with_ops_groups(&wimax_gnl_family,
wimax_gnl_ops,
wimax_gnl_mcgrps);
if (unlikely(result < 0)) {
pr_err("cannot register generic netlink family: %d\n", result);
goto error_register_family;
}
d_fnend(4, NULL, "() = 0\n");
return 0;
error_register_family:
d_fnend(4, NULL, "() = %d\n", result);
return result;
}
module_init(wimax_subsys_init);
/* Shutdown the wimax stack */
static
void __exit wimax_subsys_exit(void)
{
wimax_id_table_release();
genl_unregister_family(&wimax_gnl_family);
}
module_exit(wimax_subsys_exit);
MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
MODULE_DESCRIPTION("Linux WiMAX stack");
MODULE_LICENSE("GPL");