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* cfg80211: default CONFIG_WIRELESS_OLD_REGULATORY to nLuis R. Rodriguez2009-03-27
| | | | | | | | And update description and feature-removal schedule according to the new plan. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: fix locking in nl80211_set_wiphyJohannes Berg2009-03-27
| | | | | | | | | | | | | | | | | Luis reports that there's a circular locking dependency; this is because cfg80211_dev_rename() will acquire the cfg80211_mutex while the device mutex is held, while this normally is done the other way around. The solution is to open-code the device-getting in nl80211_set_wiphy and require holding the mutex around cfg80211_dev_rename rather than acquiring it within. Also fix a bug -- rtnl locking is expected by drivers so we need to provide it. Reported-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: add feature to hold bssKalle Valo2009-03-27
| | | | | | | | | In beacon filtering there needs to be a way to not expire the BSS even when no beacons are received. Add an interface to cfg80211 to hold BSS and make sure that it's not expired. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: accept no-op interface mode changesJohannes Berg2009-03-27
| | | | | | | | When somebody tries to set the interface mode to the existing mode, don't ask the driver but silently accept the setting. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: remove code about country IE support with OLD_REGLuis R. Rodriguez2009-03-27
| | | | | | | | | | | | | We had left in code to allow interested developers to add support for parsing country IEs when OLD_REG was enabled. This never happened and since we're going to remove OLD_REG lets just remove these comments and code for it. This code path was never being entered so this has no functional change. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: make regdom module parameter available oustide of OLD_REGLuis R. Rodriguez2009-03-27
| | | | | | | | | | | | | | | | | | | | | | | It seems a few users are using this module parameter although its not recommended. People are finding it useful despite there being utilities for setting this in userspace. I'm not aware of any distribution using this though. Until userspace and distributions catch up with a default userspace automatic replacement (GeoClue integration would be nirvana) we copy the ieee80211_regdom module parameter from OLD_REG to the new reg code to help these users migrate. Users who are using the non-valid ISO / IEC 3166 alpha "EU" in their ieee80211_regdom module parameter and migrate to non-OLD_REG enabled system will world roam. This also schedules removal of this same ieee80211_regdom module parameter circa March 2010. Hope is by then nirvana is reached and users will abandoned the module parameter completely. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: fix incorrect assumption on last_request for 11dLuis R. Rodriguez2009-03-27
| | | | | | | | | | | | | | | | | | | | | The incorrect assumption is the last regulatory request (last_request) is always a country IE when processing country IEs. Although this is true 99% of the time the first time this happens this could not be true. This fixes an oops in the branch check for the last_request when accessing drv_last_ie. The access was done under the assumption the struct won't be null. Note to stable: to port to 29 replace as follows, only 29 has country IE code: s|NL80211_REGDOM_SET_BY_COUNTRY_IE|REGDOM_SET_BY_COUNTRY_IE Cc: stable@kernel.org Reported-by: Quentin Armitage <Quentin@armitage.org.uk> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: force last_request to be set for OLD_REG if regdom is EULuis R. Rodriguez2009-03-27
| | | | | | | | | | Although EU is a bogus alpha2 we need to process the send request as our code depends on last_request being set. Cc: stable@kernel.org Reported-by: Quentin Armitage <Quentin@armitage.org.uk> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Check iftype in cfg80211 codeJouni Malinen2009-03-27
| | | | | | | | | We do not want to require all the drivers using cfg80211 to need to do this. In addition, make the error values consistent by using EOPNOTSUPP instead of semi-random assortment of errno values. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Check that netif_runnin is true in cfg80211 codeJouni Malinen2009-03-27
| | | | | | | | | We do not want to require all the drivers using cfg80211 to need to do this or to be prepared to handle these commands when the interface is down. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Add more through validation of MLME command parametersJouni Malinen2009-03-27
| | | | | | | | | | Check that the used authentication type and reason code are valid here so that drivers/mac80211 do not need to care about this. In addition, remove the unnecessary validation of SSID attribute length which is taken care of by netlink policy. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Remove NL80211_CMD_SET_MGMT_EXTRA_IEJouni Malinen2009-03-27
| | | | | | | | | | | | | | | | | | | The functionality that NL80211_CMD_SET_MGMT_EXTRA_IE provided can now be achieved with cleaner design by adding IE(s) into NL80211_CMD_TRIGGER_SCAN, NL80211_CMD_AUTHENTICATE, NL80211_CMD_ASSOCIATE, NL80211_CMD_DEAUTHENTICATE, and NL80211_CMD_DISASSOCIATE. Since this is a very recently added command and there are no known (or known planned) applications using NL80211_CMD_SET_MGMT_EXTRA_IE and taken into account how much extra complexity it adds to the IE processing we have now (and need to add in the future to fix IE order in couple of frames), it looks like the best option is to just remove the implementation of this command for now. The enum values themselves are left to avoid changing the nl80211 command or attribute numbers. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Add MLME primitives to support external SMEJouni Malinen2009-03-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds new nl80211 commands to allow user space to request authentication and association (and also deauthentication and disassociation). The commands are structured to allow separate authentication and association steps, i.e., the interface between kernel and user space is similar to the MLME SAP interface in IEEE 802.11 standard and an user space application takes the role of the SME. The patch introduces MLME-AUTHENTICATE.request, MLME-{,RE}ASSOCIATE.request, MLME-DEAUTHENTICATE.request, and MLME-DISASSOCIATE.request primitives. The authentication and association commands request the actual operations in two steps (assuming the driver supports this; if not, separate authentication step is skipped; this could end up being a separate "connect" command). The initial implementation for mac80211 uses the current net/mac80211/mlme.c for actual sending and processing of management frames and the new nl80211 commands will just stop the current state machine from moving automatically from authentication to association. Future cleanup may move more of the MLME operations into cfg80211. The goal of this design is to provide more control of authentication and association process to user space without having to move the full MLME implementation. This should be enough to allow IEEE 802.11r FT protocol and 802.11s SAE authentication to be implemented. Obviously, this will also bring the extra benefit of not having to use WEXT for association requests with mac80211. An example implementation of a user space SME using the new nl80211 commands is available for wpa_supplicant. This patch is enough to get IEEE 802.11r FT protocol working with over-the-air mechanism (over-the-DS will need additional MLME primitives for handling the FT Action frames). Signed-off-by: Jouni Malinen <j@w1.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: Event notifications for MLME eventsJouni Malinen2009-03-27
| | | | | | | | | | | | | | | | | | | | Add new nl80211 event notifications (and a new multicast group, "mlme") for informing user space about received and processed Authentication, (Re)Association Response, Deauthentication, and Disassociation frames in station and IBSS modes (i.e., MLME SAP interface primitives MLME-AUTHENTICATE.confirm, MLME-ASSOCIATE.confirm, MLME-REASSOCIATE.confirm, MLME-DEAUTHENTICATE.indicate, and MLME-DISASSOCIATE.indication). The event data is encapsulated as the 802.11 management frame since we already have the frame in that format and it includes all the needed information. This is the initial step in providing MLME SAP interface for authentication and association with nl80211. In other words, kernel code will act as the MLME and a user space application can control it as the SME. Signed-off-by: Jouni Malinen <j@w1.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: rework lockingJohannes Berg2009-03-27
| | | | | | | | | | | | | | | When I added scanning to cfg80211, we got a lock dependency like this: rtnl --> cfg80211_mtx nl80211, on the other hand, has the reverse lock dependency: cfg80211_mtx --> rtnl which clearly is a bad idea. This patch reworks nl80211 to take these two locks in the other order to fix the possible, and easily triggerable, deadlock. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* nl80211: export supported commandsJohannes Berg2009-03-27
| | | | | | | | | | This makes nl80211 export the supported commands (command groups) per wiphy so userspace has an idea what it can do -- this will be required reading for userspace when we introduce auth/assoc /or/ connect for older hardware that cannot separate auth and assoc. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211/nl80211: remove usage of CONFIG_NL80211Reinette Chatre2009-03-27
| | | | | | | | | | | | | The scan capability added to cfg80211/nl80211 introduced a dependency on nl80211 by cfg80211. We can thus no longer have just cfg80211 without nl80211. Specifically, cfg80211_scan_done() calls nl80211_send_scan_aborted() or nl80211_send_scan_done(). Now we remove the option for user to select nl80211. It will always be compiled if user selects cfg80211. Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* Merge branch 'master' of ↵David S. Miller2009-03-23
|\ | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/ucc_geth.c
| * nl80211: Check that function pointer != NULL before using itJouni Malinen2009-03-20
| | | | | | | | | | | | | | | | | | | | | | | | NL80211_CMD_GET_MESH_PARAMS and NL80211_CMD_SET_MESH_PARAMS handlers did not verify whether a function pointer is NULL (not supported by the driver) before trying to call the function. The former nl80211 command is available for unprivileged users, too, so this can potentially allow normal users to kill networking (or worse..) if mac80211 is built without CONFIG_MAC80211_MESH=y. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | Merge branch 'master' of ↵David S. Miller2009-03-17
|\ \ | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
| * | cfg80211: add regulatory netlink multicast groupLuis R. Rodriguez2009-03-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This allows us to send to userspace "regulatory" events. For now we just send an event when we change regulatory domains. We also notify userspace when devices are using their own custom world roaming regulatory domains. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
| * | cfg80211: move enum reg_set_by to nl80211.hLuis R. Rodriguez2009-03-16
| | | | | | | | | | | | | | | | | | | | | | | | We do this so we can later inform userspace who set the regulatory domain and provide details of the request. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
| * | cfg80211: remove REGDOM_SET_BY_INITLuis R. Rodriguez2009-03-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is not used as we can always just assume the first regulatory domain set will _always_ be a static regulatory domain. REGDOM_SET_BY_CORE will be the first request from cfg80211 for a regdomain and that then populates the first regulatory request. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
| * | cfg80211: fix max tx power for world regdom on 5 GHz to 20dBmLuis R. Rodriguez2009-03-16
| | | | | | | | | | | | | | | | | | | | | This is the lowest value amongst countries which do enable 5 GHz operation. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
| * | cfg80211: Enable passive scan on channels 12-14 for world roamingLuis R. Rodriguez2009-03-16
| | | | | | | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | | Merge branch 'master' of ↵David S. Miller2009-03-17
|\ \ \ | |/ / |/| / | |/ | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/igb/igb_main.c drivers/net/qlge/qlge_main.c drivers/net/wireless/ath9k/ath9k.h drivers/net/wireless/ath9k/core.h drivers/net/wireless/ath9k/hw.c
| * lib80211: silence excessive crypto debugging messagesJohn W. Linville2009-03-16
| | | | | | | | | | | | | | | | When they were part of the now defunct ieee80211 component, these messages were only visible when special debugging settings were enabled. Let's mirror that with a new lib80211 debugging Kconfig option. Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | Merge branch 'master' of ↵David S. Miller2009-03-10
|\| | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/bnx2x_main.c drivers/net/wireless/iwlwifi/iwl3945-base.c drivers/net/wireless/rt2x00/rt73usb.c
| * cfg80211: test before subtraction on unsignedRoel Kluin2009-03-06
| | | | | | | | | | | | | | freq_diff is unsigned, so test before subtraction Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | nl80211: Avoid AP mode BUG_ON hang with invalid lock assertJouni Malinen2009-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | "cfg80211: add assert_cfg80211_lock() to ensure proper protection" added assert_cfg80211_lock() calls into various places. At least one of them, nl80211_send_wiphy(), should not have been there. That triggers the BUG_ON in assert_cfg80211_lock() and pretty much kills the kernel whenever someone runs hostapd.. Remove that call and make assert_cfg80211_lock() use WARN_ON instead of BUG_ON to be a bit more friendly to users. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: pass the regulatory_request to ignore_requestLuis R. Rodriguez2009-02-27
| | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: do not kzalloc() again for a new request on __regulatory_hintLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | Since we already have a regulatory request from the workqueue use that and avoid a new kzalloc() Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: pass the regulatory_request struct in __regulatory_hint()Luis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | We were passing value by value, lets just pass the struct. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: make __regulatory_hint() staticLuis R. Rodriguez2009-02-27
| | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: Add AP beacon regulatory hintsLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When devices are world roaming they cannot beacon or do active scan on 5 GHz or on channels 12, 13 and 14 on the 2 GHz band. Although we have a good regulatory API some cards may _always_ world roam, this is also true when a system does not have CRDA present. Devices doing world roaming can still passive scan, if they find a beacon from an AP on one of the world roaming frequencies we make the assumption we can do the same and we also remove the passive scan requirement. This adds support for providing beacon regulatory hints based on scans. This works for devices that do either hardware or software scanning. If a channel has not yet been marked as having had a beacon present on it we queue the beacon hint processing into the workqueue. All wireless devices will benefit from beacon regulatory hints from any wireless device on a system including new devices connected to the system at a later time. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: enable 5 GHz world roaming channelsLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | | | | | The current static world regulatory domain is too restrictive, we can use some 5 GHz channels world wide so long as they do not touch frequencies which require DFS. The compromise is we must also enforce passive scanning and disallow usage of a mode of operation that beacons: (AP | IBSS | Mesh) Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: enable active-scan / beaconing on Ch 1-11 for world regdomLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | This enables active scan and beaconing on Channels 1 through 11 on the static world regulatory domain. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: rename regdom_changed to regdom_changes() and use itLuis R. Rodriguez2009-02-27
| | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: allow drivers that agree on regulatory to agreeLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | This allows drivers that agree on regulatory to share their regulatory domain. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: comments style cleanupLuis R. Rodriguez2009-02-27
| | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: move all regulatory hints to workqueueLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | All regulatory hints (core, driver, userspace and 11d) are now processed in a workqueue. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: free rd on unlikely event on 11d hintLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | This was never happening but it was still wrong, so correct it. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: remove likely from an 11d hint caseLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | Truth of the matter this was confusing people so mark it as unlikely as that is the case now. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: protect first access of last_request on 11d hint under mutexLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | | | | | We were not protecting last_request there is a small possible race between an 11d hint and another routine which calls reset_regdomains() which can prevent a valid country IE from being processed. This is not critical as it will still be procesed soon after but locking prior to it is correct. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: make regulatory_request use wiphy_idx instead of wiphyLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | We do this so later on we can move the pending requests onto a workqueue. By using the wiphy_idx instead of the wiphy we can later easily check if the wiphy has disappeared or not. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: add assert_cfg80211_lock() to ensure proper protectionLuis R. Rodriguez2009-02-27
| | | | | | | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: propagate -ENOMEM during regulatory_init()Luis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Calling kobject_uevent_env() can fail mainly due to out of memory conditions. We do not want to continue during such conditions so propagate that as well instead of letting cfg80211 load as if everything is peachy. Additionally lets clarify that when CRDA is not called during cfg80211's initialization _and_ if the error is not an -ENOMEM its because kobject_uevent_env() failed to call CRDA, not because CRDA failed. For those who want to find out why we also let you do so by enabling the kernel config CONFIG_CFG80211_REG_DEBUG -- you'll get an actual stack trace. So for now we'll treat non -ENOMEM kobject_uevent_env() failures as non fatal during cfg80211's initialization. CC: Greg KH <greg@kroah.com> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: add regulatory_hint_core() to separate the core reg hintLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | This makes the core hint path more readable and allows for us to later make it obvious under what circumstances we need locking or not. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | nl80211: disallow user requests prior to regulatory_init()Luis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If cfg80211 is built into the kernel there is perhaps a small time window betwen nl80211_init() and regulatory_init() where cfg80211_regdomain hasn't yet been initialized to let the wireless core do its work. During that rare case and time frame (if its even possible) we don't allow user regulatory changes as cfg80211 is working on enabling its first regulatory domain. To check for cfg80211_regdomain we now contend the entire operation using the cfg80211_mutex. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | cfg80211: rename cfg80211_drv_mutex to cfg80211_mutexLuis R. Rodriguez2009-02-27
| | | | | | | | | | | | | | | | | | 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>