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cfg80211: rename cfg80211_drv_mutex to cfg80211_mutex 

cfg80211_drv_mutex is protecting more than the driver list,
this renames it and documents what its currently supposed to
protect.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-02-21 00:04:21 -05:00 committed by John W. Linville
parent 85fd129a72
commit a1794390f1
4 changed files with 42 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
net/wireless/core.c
View File

@ -31,7 +31,12 @@ MODULE_DESCRIPTION("wireless configuration support");
* only read the list, and that can happen quite * only read the list, and that can happen quite
* often because we need to do it for each command */ * often because we need to do it for each command */
LIST_HEAD(cfg80211_drv_list); LIST_HEAD(cfg80211_drv_list);
DEFINE_MUTEX(cfg80211_drv_mutex);
/*
* This is used to protect the cfg80211_drv_list, cfg80211_regdomain, and
* the last reguluatory request receipt in regd.c
*/
DEFINE_MUTEX(cfg80211_mutex);
/* for debugfs */ /* for debugfs */
static struct dentry *ieee80211_debugfs_dir; static struct dentry *ieee80211_debugfs_dir;
@ -55,7 +60,7 @@ cfg80211_drv_by_wiphy_idx(int wiphy_idx)
return result; return result;
} }
/* requires cfg80211_drv_mutex to be held! */ /* requires cfg80211_mutex to be held! */
static struct cfg80211_registered_device * static struct cfg80211_registered_device *
__cfg80211_drv_from_info(struct genl_info *info) __cfg80211_drv_from_info(struct genl_info *info)
{ {
@ -102,7 +107,7 @@ cfg80211_get_dev_from_info(struct genl_info *info)
{ {
struct cfg80211_registered_device *drv; struct cfg80211_registered_device *drv;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
drv = __cfg80211_drv_from_info(info); drv = __cfg80211_drv_from_info(info);
/* if it is not an error we grab the lock on /* if it is not an error we grab the lock on
@ -111,7 +116,7 @@ cfg80211_get_dev_from_info(struct genl_info *info)
if (!IS_ERR(drv)) if (!IS_ERR(drv))
mutex_lock(&drv->mtx); mutex_lock(&drv->mtx);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
return drv; return drv;
} }
@ -122,7 +127,7 @@ cfg80211_get_dev_from_ifindex(int ifindex)
struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
struct net_device *dev; struct net_device *dev;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
dev = dev_get_by_index(&init_net, ifindex); dev = dev_get_by_index(&init_net, ifindex);
if (!dev) if (!dev)
goto out; goto out;
@ -133,7 +138,7 @@ cfg80211_get_dev_from_ifindex(int ifindex)
drv = ERR_PTR(-ENODEV); drv = ERR_PTR(-ENODEV);
dev_put(dev); dev_put(dev);
out: out:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
return drv; return drv;
} }
@ -149,7 +154,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
struct cfg80211_registered_device *drv; struct cfg80211_registered_device *drv;
int wiphy_idx, taken = -1, result, digits; int wiphy_idx, taken = -1, result, digits;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
/* prohibit calling the thing phy%d when %d is not its number */ /* prohibit calling the thing phy%d when %d is not its number */
sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
@ -197,7 +202,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
result = 0; result = 0;
out_unlock: out_unlock:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
if (result == 0) if (result == 0)
nl80211_notify_dev_rename(rdev); nl80211_notify_dev_rename(rdev);
@ -224,19 +229,19 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
drv->ops = ops; drv->ops = ops;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
drv->wiphy_idx = wiphy_counter++; drv->wiphy_idx = wiphy_counter++;
if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) { if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
wiphy_counter--; wiphy_counter--;
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
/* ugh, wrapped! */ /* ugh, wrapped! */
kfree(drv); kfree(drv);
return NULL; return NULL;
} }
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
/* give it a proper name */ /* give it a proper name */
dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx); dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
@ -314,7 +319,7 @@ int wiphy_register(struct wiphy *wiphy)
/* check and set up bitrates */ /* check and set up bitrates */
ieee80211_set_bitrate_flags(wiphy); ieee80211_set_bitrate_flags(wiphy);
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
/* set up regulatory info */ /* set up regulatory info */
wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE); wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
@ -334,7 +339,7 @@ int wiphy_register(struct wiphy *wiphy)
res = 0; res = 0;
out_unlock: out_unlock:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
return res; return res;
} }
EXPORT_SYMBOL(wiphy_register); EXPORT_SYMBOL(wiphy_register);
@ -344,7 +349,7 @@ void wiphy_unregister(struct wiphy *wiphy)
struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
/* protect the device list */ /* protect the device list */
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
BUG_ON(!list_empty(&drv->netdev_list)); BUG_ON(!list_empty(&drv->netdev_list));
@ -370,7 +375,7 @@ void wiphy_unregister(struct wiphy *wiphy)
device_del(&drv->wiphy.dev); device_del(&drv->wiphy.dev);
debugfs_remove(drv->wiphy.debugfsdir); debugfs_remove(drv->wiphy.debugfsdir);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
} }
EXPORT_SYMBOL(wiphy_unregister); EXPORT_SYMBOL(wiphy_unregister);

6
net/wireless/core.h
View File

@ -70,7 +70,7 @@ bool wiphy_idx_valid(int wiphy_idx)
return (wiphy_idx >= 0); return (wiphy_idx >= 0);
} }
extern struct mutex cfg80211_drv_mutex; extern struct mutex cfg80211_mutex;
extern struct list_head cfg80211_drv_list; extern struct list_head cfg80211_drv_list;
struct cfg80211_internal_bss { struct cfg80211_internal_bss {
@ -89,13 +89,13 @@ struct cfg80211_internal_bss {
* the driver's mutex! * the driver's mutex!
* *
* This means that you need to call cfg80211_put_dev() * This means that you need to call cfg80211_put_dev()
* before being allowed to acquire &cfg80211_drv_mutex! * before being allowed to acquire &cfg80211_mutex!
* *
* This is necessary because we need to lock the global * This is necessary because we need to lock the global
* mutex to get an item off the list safely, and then * mutex to get an item off the list safely, and then
* we lock the drv mutex so it doesn't go away under us. * we lock the drv mutex so it doesn't go away under us.
* *
* We don't want to keep cfg80211_drv_mutex locked * We don't want to keep cfg80211_mutex locked
* for all the time in order to allow requests on * for all the time in order to allow requests on
* other interfaces to go through at the same time. * other interfaces to go through at the same time.
* *

20
net/wireless/nl80211.c
View File

@ -256,7 +256,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
int start = cb->args[0]; int start = cb->args[0];
struct cfg80211_registered_device *dev; struct cfg80211_registered_device *dev;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
list_for_each_entry(dev, &cfg80211_drv_list, list) { list_for_each_entry(dev, &cfg80211_drv_list, list) {
if (++idx <= start) if (++idx <= start)
continue; continue;
@ -267,7 +267,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
break; break;
} }
} }
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
cb->args[0] = idx; cb->args[0] = idx;
@ -470,7 +470,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
struct cfg80211_registered_device *dev; struct cfg80211_registered_device *dev;
struct wireless_dev *wdev; struct wireless_dev *wdev;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
list_for_each_entry(dev, &cfg80211_drv_list, list) { list_for_each_entry(dev, &cfg80211_drv_list, list) {
if (wp_idx < wp_start) { if (wp_idx < wp_start) {
wp_idx++; wp_idx++;
@ -497,7 +497,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
wp_idx++; wp_idx++;
} }
out: out:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
cb->args[0] = wp_idx; cb->args[0] = wp_idx;
cb->args[1] = if_idx; cb->args[1] = if_idx;
@ -1916,9 +1916,9 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
if (is_world_regdom(data)) if (is_world_regdom(data))
return -EINVAL; return -EINVAL;
#endif #endif
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
r = __regulatory_hint(NULL, REGDOM_SET_BY_USER, data, 0, ENVIRON_ANY); r = __regulatory_hint(NULL, REGDOM_SET_BY_USER, data, 0, ENVIRON_ANY);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
/* This means the regulatory domain was already set, however /* This means the regulatory domain was already set, however
* we don't want to confuse userspace with a "successful error" * we don't want to confuse userspace with a "successful error"
* message so lets just treat it as a success */ * message so lets just treat it as a success */
@ -2112,7 +2112,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
unsigned int i; unsigned int i;
int err = -EINVAL; int err = -EINVAL;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
if (!cfg80211_regdomain) if (!cfg80211_regdomain)
goto out; goto out;
@ -2175,7 +2175,7 @@ nla_put_failure:
genlmsg_cancel(msg, hdr); genlmsg_cancel(msg, hdr);
err = -EMSGSIZE; err = -EMSGSIZE;
out: out:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
return err; return err;
} }
@ -2234,9 +2234,9 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
BUG_ON(rule_idx != num_rules); BUG_ON(rule_idx != num_rules);
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
r = set_regdom(rd); r = set_regdom(rd);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
return r; return r;
bad_reg: bad_reg:

18
net/wireless/reg.c
View File

@ -1116,7 +1116,7 @@ static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
return -EINVAL; return -EINVAL;
} }
/* Caller must hold &cfg80211_drv_mutex */ /* Caller must hold &cfg80211_mutex */
int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by, int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
const char *alpha2, const char *alpha2,
u32 country_ie_checksum, u32 country_ie_checksum,
@ -1188,13 +1188,13 @@ void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
int r; int r;
BUG_ON(!alpha2); BUG_ON(!alpha2);
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER,
alpha2, 0, ENVIRON_ANY); alpha2, 0, ENVIRON_ANY);
/* This is required so that the orig_* parameters are saved */ /* This is required so that the orig_* parameters are saved */
if (r == -EALREADY && wiphy->strict_regulatory) if (r == -EALREADY && wiphy->strict_regulatory)
wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER); wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
} }
EXPORT_SYMBOL(regulatory_hint); EXPORT_SYMBOL(regulatory_hint);
@ -1225,7 +1225,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
if (!last_request) if (!last_request)
return; return;
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
/* IE len must be evenly divisible by 2 */ /* IE len must be evenly divisible by 2 */
if (country_ie_len & 0x01) if (country_ie_len & 0x01)
@ -1307,7 +1307,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
country_ie_regdomain->alpha2, checksum, env); country_ie_regdomain->alpha2, checksum, env);
out: out:
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
} }
EXPORT_SYMBOL(regulatory_hint_11d); EXPORT_SYMBOL(regulatory_hint_11d);
@ -1562,7 +1562,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
/* Use this call to set the current regulatory domain. Conflicts with /* Use this call to set the current regulatory domain. Conflicts with
* multiple drivers can be ironed out later. Caller must've already * multiple drivers can be ironed out later. Caller must've already
* kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */ * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */
int set_regdom(const struct ieee80211_regdomain *rd) int set_regdom(const struct ieee80211_regdomain *rd)
{ {
int r; int r;
@ -1586,7 +1586,7 @@ int set_regdom(const struct ieee80211_regdomain *rd)
return r; return r;
} }
/* Caller must hold cfg80211_drv_mutex */ /* Caller must hold cfg80211_mutex */
void reg_device_remove(struct wiphy *wiphy) void reg_device_remove(struct wiphy *wiphy)
{ {
kfree(wiphy->regd); kfree(wiphy->regd);
@ -1633,7 +1633,7 @@ int regulatory_init(void)
void regulatory_exit(void) void regulatory_exit(void)
{ {
mutex_lock(&cfg80211_drv_mutex); mutex_lock(&cfg80211_mutex);
reset_regdomains(); reset_regdomains();
@ -1644,5 +1644,5 @@ void regulatory_exit(void)
platform_device_unregister(reg_pdev); platform_device_unregister(reg_pdev);
mutex_unlock(&cfg80211_drv_mutex); mutex_unlock(&cfg80211_mutex);
} }