diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2009-08-08 11:03:58 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-08-14 09:13:51 -0400 |
| commit | 4b181144e6c1c25aaba9b9fc7cc70c95495ecb92 (patch) | |
| tree | 93f85f1c99f097ec3c60f45b7b917c1b0dfbf7f9 /net/wireless | |
| parent | e312c24cf8229f9b6e76dbfd5d99eefe21f4ac0a (diff) | |
| download | linux-stable-4b181144e6c1c25aaba9b9fc7cc70c95495ecb92.tar.gz linux-stable-4b181144e6c1c25aaba9b9fc7cc70c95495ecb92.tar.bz2 linux-stable-4b181144e6c1c25aaba9b9fc7cc70c95495ecb92.zip | |
cfg80211: fix locking for SIWFREQ
"cfg80211: validate channel settings across interfaces"
contained a locking bug -- in the managed-mode SIWFREQ
call it would end up running into a lock recursion.
This fixes it by not checking that particular interface
for a channel that it needs to stay on, which is as it
should be as that's the interface we're setting the
channel for.
Reported-by: Reinette Chatre <reinette.chatre@intel.com>
Reported-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Kalle Valo <kalle.valo@iki.fi>
Tested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/chan.c | 3 | ||||
| -rw-r--r-- | net/wireless/core.h | 1 | ||||
| -rw-r--r-- | net/wireless/nl80211.c | 2 | ||||
| -rw-r--r-- | net/wireless/wext-compat.c | 2 | ||||
| -rw-r--r-- | net/wireless/wext-sme.c | 2 |
5 files changed, 6 insertions, 4 deletions
diff --git a/net/wireless/chan.c b/net/wireless/chan.c index bc00c9a06b3d..a46ac6c9b365 100644 --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -42,13 +42,14 @@ rdev_fixed_channel(struct cfg80211_registered_device *rdev, } int rdev_set_freq(struct cfg80211_registered_device *rdev, + struct wireless_dev *for_wdev, int freq, enum nl80211_channel_type channel_type) { struct ieee80211_channel *chan; struct ieee80211_sta_ht_cap *ht_cap; int result; - if (rdev_fixed_channel(rdev, NULL)) + if (rdev_fixed_channel(rdev, for_wdev)) return -EBUSY; if (!rdev->ops->set_channel) diff --git a/net/wireless/core.h b/net/wireless/core.h index 639db52eeff7..f7be3a9b427e 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -374,6 +374,7 @@ struct ieee80211_channel * rdev_fixed_channel(struct cfg80211_registered_device *rdev, struct wireless_dev *for_wdev); int rdev_set_freq(struct cfg80211_registered_device *rdev, + struct wireless_dev *for_wdev, int freq, enum nl80211_channel_type channel_type); #endif /* __NET_WIRELESS_CORE_H */ diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 667a87d307da..a8aaadeb6773 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -721,7 +721,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]); mutex_lock(&rdev->devlist_mtx); - result = rdev_set_freq(rdev, freq, channel_type); + result = rdev_set_freq(rdev, NULL, freq, channel_type); mutex_unlock(&rdev->devlist_mtx); if (result) goto bad_res; diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c index 17648dc79867..c44917492210 100644 --- a/net/wireless/wext-compat.c +++ b/net/wireless/wext-compat.c @@ -766,7 +766,7 @@ int cfg80211_wext_siwfreq(struct net_device *dev, if (freq == 0) return -EINVAL; mutex_lock(&rdev->devlist_mtx); - err = rdev_set_freq(rdev, freq, NL80211_CHAN_NO_HT); + err = rdev_set_freq(rdev, NULL, freq, NL80211_CHAN_NO_HT); mutex_unlock(&rdev->devlist_mtx); return err; } diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c index 907470063f22..d16cd9ea4d00 100644 --- a/net/wireless/wext-sme.c +++ b/net/wireless/wext-sme.c @@ -106,7 +106,7 @@ int cfg80211_mgd_wext_siwfreq(struct net_device *dev, /* SSID is not set, we just want to switch channel */ if (chan && !wdev->wext.connect.ssid_len) { - err = rdev_set_freq(rdev, freq, NL80211_CHAN_NO_HT); + err = rdev_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT); goto out; } |