git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 59bbb6f7 JB |
1 | /* |
| 2 | * This file contains helper code to handle channel | |
| 3 | * settings and keeping track of what is possible at | |
| 4 | * any point in time. | |
| 5 | * | |
| 6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
| 7 | */ | |
| 8 | ||
| 9 | #include <net/cfg80211.h> | |
| 10 | #include "core.h" | |
| 11 | ||
| 12 | struct ieee80211_channel * | |
| 13 | rdev_fixed_channel(struct cfg80211_registered_device *rdev, | |
| 14 | struct wireless_dev *for_wdev) | |
| 15 | { | |
| 16 | struct wireless_dev *wdev; | |
| 17 | struct ieee80211_channel *result = NULL; | |
| 18 | ||
| 19 | WARN_ON(!mutex_is_locked(&rdev->devlist_mtx)); | |
| 20 | ||
| 21 | list_for_each_entry(wdev, &rdev->netdev_list, list) { | |
| 22 | if (wdev == for_wdev) | |
| 23 | continue; | |
| 24 | ||
| 25 | /* | |
| 26 | * Lock manually to tell lockdep about allowed | |
| 27 | * nesting here if for_wdev->mtx is held already. | |
| 28 | * This is ok as it's all under the rdev devlist | |
| 29 | * mutex and as such can only be done once at any | |
| 30 | * given time. | |
| 31 | */ | |
| 32 | mutex_lock_nested(&wdev->mtx, SINGLE_DEPTH_NESTING); | |
| 33 | if (wdev->current_bss) | |
| 34 | result = wdev->current_bss->pub.channel; | |
| 35 | wdev_unlock(wdev); | |
| 36 | ||
| 37 | if (result) | |
| 38 | break; | |
| 39 | } | |
| 40 | ||
| 41 | return result; | |
| 42 | } | |
| 43 | ||
| 44 | int rdev_set_freq(struct cfg80211_registered_device *rdev, | |
| 45 | int freq, enum nl80211_channel_type channel_type) | |
| 46 | { | |
| 47 | struct ieee80211_channel *chan; | |
| 48 | struct ieee80211_sta_ht_cap *ht_cap; | |
| 49 | int result; | |
| 50 | ||
| 51 | if (rdev_fixed_channel(rdev, NULL)) | |
| 52 | return -EBUSY; | |
| 53 | ||
| 54 | if (!rdev->ops->set_channel) | |
| 55 | return -EOPNOTSUPP; | |
| 56 | ||
| 57 | chan = ieee80211_get_channel(&rdev->wiphy, freq); | |
| 58 | ||
| 59 | /* Primary channel not allowed */ | |
| 60 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
| 61 | return -EINVAL; | |
| 62 | ||
| 63 | if (channel_type == NL80211_CHAN_HT40MINUS && | |
| 64 | chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
| 65 | return -EINVAL; | |
| 66 | else if (channel_type == NL80211_CHAN_HT40PLUS && | |
| 67 | chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
| 68 | return -EINVAL; | |
| 69 | ||
| 70 | ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap; | |
| 71 | ||
| 72 | if (channel_type != NL80211_CHAN_NO_HT) { | |
| 73 | if (!ht_cap->ht_supported) | |
| 74 | return -EINVAL; | |
| 75 | ||
| 76 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
| 77 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
| 78 | return -EINVAL; | |
| 79 | } | |
| 80 | ||
| 81 | result = rdev->ops->set_channel(&rdev->wiphy, chan, channel_type); | |
| 82 | if (result) | |
| 83 | return result; | |
| 84 | ||
| 85 | rdev->channel = chan; | |
| 86 | ||
| 87 | return 0; | |
| 88 | } |