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cfg80211: decouple regulatory variables from cfg80211_mutex 

We change regulatory code to be protected by its own regulatory
mutex and alleviate cfg80211_mutex to only be used to protect
cfg80211_rdev_list, the registered device list.

By doing this we will be able to work on regulatory core components
without having to have hog up the cfg80211_mutex. An example here is
we no longer need to use the cfg80211_mutex during driver specific
wiphy_apply_custom_regulatory(). We also no longer need it for the
the country IE regulatory hint; by doing so we end up curing this
new lockdep warning:

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.31-rc4-wl #12
-------------------------------------------------------
phy1/1709 is trying to acquire lock:
 (cfg80211_mutex){+.+.+.}, at: [<ffffffffa00af852>] regulatory_hint_11d+0x32/0x3f0 [cfg80211]

but task is already holding lock:
 (&ifmgd->mtx){+.+.+.}, at: [<ffffffffa0144228>] ieee80211_sta_work+0x108/0x10f0 [mac80211]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #3 (&ifmgd->mtx){+.+.+.}:
       [<ffffffff810857b6>] __lock_acquire+0xd76/0x12b0
       [<ffffffff81085dd3>] lock_acquire+0xe3/0x120
       [<ffffffff814eeae4>] mutex_lock_nested+0x44/0x350
       [<ffffffffa0141bb8>] ieee80211_mgd_auth+0x108/0x1f0 [mac80211]
       [<ffffffffa0148563>] ieee80211_auth+0x13/0x20 [mac80211]
       [<ffffffffa00bc3a1>] __cfg80211_mlme_auth+0x1b1/0x2a0 [cfg80211]
       [<ffffffffa00bc516>] cfg80211_mlme_auth+0x86/0xc0 [cfg80211]
       [<ffffffffa00b368d>] nl80211_authenticate+0x21d/0x230 [cfg80211]
       [<ffffffff81416ba6>] genl_rcv_msg+0x1b6/0x1f0
       [<ffffffff81415c39>] netlink_rcv_skb+0x89/0xb0
       [<ffffffff814169d9>] genl_rcv+0x29/0x40
       [<ffffffff8141591d>] netlink_unicast+0x29d/0x2b0
       [<ffffffff81416514>] netlink_sendmsg+0x214/0x300
       [<ffffffff813e4407>] sock_sendmsg+0x107/0x130
       [<ffffffff813e45b9>] sys_sendmsg+0x189/0x320
       [<ffffffff81011f82>] system_call_fastpath+0x16/0x1b
       [<ffffffffffffffff>] 0xffffffffffffffff

-> #2 (&wdev->mtx){+.+.+.}:
       [<ffffffff810857b6>] __lock_acquire+0xd76/0x12b0
       [<ffffffff81085dd3>] lock_acquire+0xe3/0x120
       [<ffffffff814eeae4>] mutex_lock_nested+0x44/0x350
       [<ffffffffa00ab304>] cfg80211_netdev_notifier_call+0x1a4/0x390 [cfg80211]
       [<ffffffff814f3dff>] notifier_call_chain+0x3f/0x80
       [<ffffffff81075a91>] raw_notifier_call_chain+0x11/0x20
       [<ffffffff813f665a>] dev_open+0x10a/0x120
       [<ffffffff813f59bd>] dev_change_flags+0x9d/0x1e0
       [<ffffffff8144eb6e>] devinet_ioctl+0x6fe/0x760
       [<ffffffff81450204>] inet_ioctl+0x94/0xc0
       [<ffffffff813e25fa>] sock_ioctl+0x6a/0x290
       [<ffffffff8111e911>] vfs_ioctl+0x31/0xa0
       [<ffffffff8111ea9a>] do_vfs_ioctl+0x8a/0x5c0
       [<ffffffff8111f069>] sys_ioctl+0x99/0xa0
       [<ffffffff81011f82>] system_call_fastpath+0x16/0x1b
       [<ffffffffffffffff>] 0xffffffffffffffff

-> #1 (&rdev->mtx){+.+.+.}:
       [<ffffffff810857b6>] __lock_acquire+0xd76/0x12b0
       [<ffffffff81085dd3>] lock_acquire+0xe3/0x120
       [<ffffffff814eeae4>] mutex_lock_nested+0x44/0x350
       [<ffffffffa00ac4d0>] cfg80211_get_dev_from_ifindex+0x60/0x90 [cfg80211]
       [<ffffffffa00b21ff>] get_rdev_dev_by_info_ifindex+0x6f/0xa0 [cfg80211]
       [<ffffffffa00b51eb>] nl80211_set_interface+0x3b/0x260 [cfg80211]
       [<ffffffff81416ba6>] genl_rcv_msg+0x1b6/0x1f0
       [<ffffffff81415c39>] netlink_rcv_skb+0x89/0xb0
       [<ffffffff814169d9>] genl_rcv+0x29/0x40
       [<ffffffff8141591d>] netlink_unicast+0x29d/0x2b0
       [<ffffffff81416514>] netlink_sendmsg+0x214/0x300
       [<ffffffff813e4407>] sock_sendmsg+0x107/0x130
       [<ffffffff813e45b9>] sys_sendmsg+0x189/0x320
       [<ffffffff81011f82>] system_call_fastpath+0x16/0x1b
       [<ffffffffffffffff>] 0xffffffffffffffff

other info that might help us debug this:

3 locks held by phy1/1709:
 #0:  ((wiphy_name(local->hw.wiphy))){+.+.+.}, at: [<ffffffff8106b45d>] worker_thread+0x19d/0x340
 #1:  (&ifmgd->work){+.+.+.}, at: [<ffffffff8106b45d>] worker_thread+0x19d/0x340
 #2:  (&ifmgd->mtx){+.+.+.}, at: [<ffffffffa0144228>] ieee80211_sta_work+0x108/0x10f0 [mac80211]

Reported-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
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 2009-07-30 17:38:08 -07:00 committed by John W. Linville
parent 4b44c8bc4d
commit abc7381bcc
2 changed files with 38 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/wireless/core.c
View File

@ -34,9 +34,7 @@ MODULE_DESCRIPTION("wireless configuration support");
LIST_HEAD(cfg80211_rdev_list);
/*
* This is used to protect the cfg80211_rdev_list, cfg80211_regdomain,
* country_ie_regdomain, the reg_beacon_list and the the last regulatory
* request receipt (last_request).
* This is used to protect the cfg80211_rdev_list
*/
DEFINE_MUTEX(cfg80211_mutex);

46
net/wireless/reg.c
View File

@ -62,6 +62,16 @@ const struct ieee80211_regdomain *cfg80211_regdomain;
*/
static const struct ieee80211_regdomain *country_ie_regdomain;
/*
* Protects static reg.c components:
* - cfg80211_world_regdom
* - cfg80211_regdom
* - country_ie_regdomain
* - last_request
*/
DEFINE_MUTEX(reg_mutex);
#define assert_reg_lock() WARN_ON(!mutex_is_locked(&reg_mutex))
/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);
static spinlock_t reg_requests_lock;
@ -1293,7 +1303,7 @@ static void handle_channel_custom(struct wiphy *wiphy,
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
assert_cfg80211_lock();
assert_reg_lock();
sband = wiphy->bands[band];
BUG_ON(chan_idx >= sband->n_channels);
@ -1342,14 +1352,14 @@ void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
enum ieee80211_band band;
unsigned int bands_set = 0;
mutex_lock(&cfg80211_mutex);
mutex_lock(&reg_mutex);
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!wiphy->bands[band])
continue;
handle_band_custom(wiphy, band, regd);
bands_set++;
}
mutex_unlock(&cfg80211_mutex);
mutex_unlock(&reg_mutex);
/*
* no point in calling this if it won't have any effect
@ -1495,7 +1505,7 @@ static int ignore_request(struct wiphy *wiphy,
* Returns zero if all went fine, %-EALREADY if a regulatory domain had
* already been set or other standard error codes.
*
* Caller must hold &cfg80211_mutex
* Caller must hold &cfg80211_mutex and &reg_mutex
*/
static int __regulatory_hint(struct wiphy *wiphy,
struct regulatory_request *pending_request)
@ -1570,6 +1580,7 @@ static void reg_process_hint(struct regulatory_request *reg_request)
BUG_ON(!reg_request->alpha2);
mutex_lock(&cfg80211_mutex);
mutex_lock(&reg_mutex);
if (wiphy_idx_valid(reg_request->wiphy_idx))
wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
@ -1585,6 +1596,7 @@ static void reg_process_hint(struct regulatory_request *reg_request)
if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
wiphy_update_regulatory(wiphy, reg_request->initiator);
out:
mutex_unlock(&reg_mutex);
mutex_unlock(&cfg80211_mutex);
}
@ -1613,6 +1625,10 @@ static void reg_process_pending_beacon_hints(void)
struct cfg80211_registered_device *rdev;
struct reg_beacon *pending_beacon, *tmp;
/*
* No need to hold the reg_mutex here as we just touch wiphys
* and do not read or access regulatory variables.
*/
mutex_lock(&cfg80211_mutex);
/* This goes through the _pending_ beacon list */
@ -1734,12 +1750,13 @@ int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
}
EXPORT_SYMBOL(regulatory_hint);
/* Caller must hold reg_mutex */
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
u32 country_ie_checksum)
{
struct wiphy *request_wiphy;
assert_cfg80211_lock();
assert_reg_lock();
if (unlikely(last_request->initiator !=
NL80211_REGDOM_SET_BY_COUNTRY_IE))
@ -1776,7 +1793,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
enum environment_cap env = ENVIRON_ANY;
struct regulatory_request *request;
mutex_lock(&cfg80211_mutex);
mutex_lock(&reg_mutex);
if (unlikely(!last_request))
goto out;
@ -1850,7 +1867,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
request->country_ie_checksum = checksum;
request->country_ie_env = env;
mutex_unlock(&cfg80211_mutex);
mutex_unlock(&reg_mutex);
queue_regulatory_request(request);
@ -1859,7 +1876,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
free_rd_out:
kfree(rd);
out:
mutex_unlock(&cfg80211_mutex);
mutex_unlock(&reg_mutex);
}
EXPORT_SYMBOL(regulatory_hint_11d);
@ -2192,10 +2209,13 @@ int set_regdom(const struct ieee80211_regdomain *rd)
assert_cfg80211_lock();
mutex_lock(&reg_mutex);
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
if (r) {
kfree(rd);
mutex_unlock(&reg_mutex);
return r;
}
@ -2210,6 +2230,8 @@ int set_regdom(const struct ieee80211_regdomain *rd)
nl80211_send_reg_change_event(last_request);
mutex_unlock(&reg_mutex);
return r;
}
@ -2220,16 +2242,20 @@ void reg_device_remove(struct wiphy *wiphy)
assert_cfg80211_lock();
mutex_lock(&reg_mutex);
kfree(wiphy->regd);
if (last_request)
request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
if (!request_wiphy || request_wiphy != wiphy)
return;
goto out;
last_request->wiphy_idx = WIPHY_IDX_STALE;
last_request->country_ie_env = ENVIRON_ANY;
out:
mutex_unlock(&reg_mutex);
}
int regulatory_init(void)
@ -2290,6 +2316,7 @@ void regulatory_exit(void)
cancel_work_sync(&reg_work);
mutex_lock(&cfg80211_mutex);
mutex_lock(&reg_mutex);
reset_regdomains();
@ -2328,5 +2355,6 @@ void regulatory_exit(void)
}
spin_unlock(&reg_requests_lock);
mutex_unlock(&reg_mutex);
mutex_unlock(&cfg80211_mutex);
}