From a1794390f1afc3631ac056e0f1677b7ab6f7ee74 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Sat, 21 Feb 2009 00:04:21 -0500 Subject: [PATCH] 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 Signed-off-by: John W. Linville --- net/wireless/core.c | 35 ++++++++++++++++++++--------------- net/wireless/core.h | 6 +++--- net/wireless/nl80211.c | 20 ++++++++++---------- net/wireless/reg.c | 18 +++++++++--------- 4 files changed, 42 insertions(+), 37 deletions(-) diff --git a/net/wireless/core.c b/net/wireless/core.c index 35d457b2751e..39d40d1e06db 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -31,7 +31,12 @@ MODULE_DESCRIPTION("wireless configuration support"); * only read the list, and that can happen quite * often because we need to do it for each command */ 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 */ static struct dentry *ieee80211_debugfs_dir; @@ -55,7 +60,7 @@ cfg80211_drv_by_wiphy_idx(int wiphy_idx) return result; } -/* requires cfg80211_drv_mutex to be held! */ +/* requires cfg80211_mutex to be held! */ static struct cfg80211_registered_device * __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; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); drv = __cfg80211_drv_from_info(info); /* 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)) mutex_lock(&drv->mtx); - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); return drv; } @@ -122,7 +127,7 @@ cfg80211_get_dev_from_ifindex(int ifindex) struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); struct net_device *dev; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); dev = dev_get_by_index(&init_net, ifindex); if (!dev) goto out; @@ -133,7 +138,7 @@ cfg80211_get_dev_from_ifindex(int ifindex) drv = ERR_PTR(-ENODEV); dev_put(dev); out: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); return drv; } @@ -149,7 +154,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, struct cfg80211_registered_device *drv; 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 */ sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); @@ -197,7 +202,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, result = 0; out_unlock: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); if (result == 0) nl80211_notify_dev_rename(rdev); @@ -224,19 +229,19 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) drv->ops = ops; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); drv->wiphy_idx = wiphy_counter++; if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) { wiphy_counter--; - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); /* ugh, wrapped! */ kfree(drv); return NULL; } - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); /* give it a proper name */ 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 */ ieee80211_set_bitrate_flags(wiphy); - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); /* set up regulatory info */ wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE); @@ -334,7 +339,7 @@ int wiphy_register(struct wiphy *wiphy) res = 0; out_unlock: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); return res; } EXPORT_SYMBOL(wiphy_register); @@ -344,7 +349,7 @@ void wiphy_unregister(struct wiphy *wiphy) struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); /* protect the device list */ - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); BUG_ON(!list_empty(&drv->netdev_list)); @@ -370,7 +375,7 @@ void wiphy_unregister(struct wiphy *wiphy) device_del(&drv->wiphy.dev); debugfs_remove(drv->wiphy.debugfsdir); - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); } EXPORT_SYMBOL(wiphy_unregister); diff --git a/net/wireless/core.h b/net/wireless/core.h index 4f2e0fe38ce3..f3ab00cbf766 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -70,7 +70,7 @@ bool wiphy_idx_valid(int wiphy_idx) return (wiphy_idx >= 0); } -extern struct mutex cfg80211_drv_mutex; +extern struct mutex cfg80211_mutex; extern struct list_head cfg80211_drv_list; struct cfg80211_internal_bss { @@ -89,13 +89,13 @@ struct cfg80211_internal_bss { * the driver's mutex! * * 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 * 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 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 * other interfaces to go through at the same time. * diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index b176bb800100..88a530f707e6 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -256,7 +256,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) int start = cb->args[0]; struct cfg80211_registered_device *dev; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); list_for_each_entry(dev, &cfg80211_drv_list, list) { if (++idx <= start) continue; @@ -267,7 +267,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) break; } } - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); 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 wireless_dev *wdev; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); list_for_each_entry(dev, &cfg80211_drv_list, list) { if (wp_idx < wp_start) { wp_idx++; @@ -497,7 +497,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback * wp_idx++; } out: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); cb->args[0] = wp_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)) return -EINVAL; #endif - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); 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 * we don't want to confuse userspace with a "successful error" * 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; int err = -EINVAL; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); if (!cfg80211_regdomain) goto out; @@ -2175,7 +2175,7 @@ nla_put_failure: genlmsg_cancel(msg, hdr); err = -EMSGSIZE; out: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); 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); - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); r = set_regdom(rd); - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); return r; bad_reg: diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 2323644330cd..ba823120d245 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -1116,7 +1116,7 @@ static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by, 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, const char *alpha2, u32 country_ie_checksum, @@ -1188,13 +1188,13 @@ void regulatory_hint(struct wiphy *wiphy, const char *alpha2) int r; BUG_ON(!alpha2); - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY); /* This is required so that the orig_* parameters are saved */ if (r == -EALREADY && wiphy->strict_regulatory) wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER); - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); } EXPORT_SYMBOL(regulatory_hint); @@ -1225,7 +1225,7 @@ void regulatory_hint_11d(struct wiphy *wiphy, if (!last_request) return; - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); /* IE len must be evenly divisible by 2 */ if (country_ie_len & 0x01) @@ -1307,7 +1307,7 @@ void regulatory_hint_11d(struct wiphy *wiphy, country_ie_regdomain->alpha2, checksum, env); out: - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); } 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 * 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 r; @@ -1586,7 +1586,7 @@ int set_regdom(const struct ieee80211_regdomain *rd) return r; } -/* Caller must hold cfg80211_drv_mutex */ +/* Caller must hold cfg80211_mutex */ void reg_device_remove(struct wiphy *wiphy) { kfree(wiphy->regd); @@ -1633,7 +1633,7 @@ int regulatory_init(void) void regulatory_exit(void) { - mutex_lock(&cfg80211_drv_mutex); + mutex_lock(&cfg80211_mutex); reset_regdomains(); @@ -1644,5 +1644,5 @@ void regulatory_exit(void) platform_device_unregister(reg_pdev); - mutex_unlock(&cfg80211_drv_mutex); + mutex_unlock(&cfg80211_mutex); }