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path: root/net/mac80211/mesh_plink.c
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* mac80211: enable WME for peer mesh STAChun-Yeow Yeoh2014-01-06
| | | | | | | | Enable the WME for peer mesh STA so that the driver, such as wcn36xx, will pick this up and enabling it in HW. Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: use put_unaligned_le16 in mesh_plink_frame_txChun-Yeow Yeoh2013-11-25
| | | | | | | Use put_unaligned_le16 in mesh_plink_frame_tx. Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: clean up mesh local link ID generationThomas Pedersen2013-11-25
| | | | | | | | | | | | | | | | | | 802.11-2012 13.3.1 implicitly limits the mesh local link ID range to that of AID, since for mesh PS the local link ID must be indicated in the TIM IE, which only holds IEEE80211_MAX_AID bits. Also the code was allowing a local link ID of 0, but this is not correct since that TIM bit is used for indicating buffered mcast frames. Generate a random, unique, link ID from 1 - 2007, and drop a modulo conversion for the local link ID, but keep it for the peer link ID in case he chose something > MAX_AID. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: factor out plink event gatheringThomas Pedersen2013-11-25
| | | | | Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: factor out peering FSMThomas Pedersen2013-11-25
| | | | | | Signed-off-by: Thomas Pedersen <thomas@cozybit.com> [fix some indentation, squash llid assignment] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: assign sta plid earlyThomas Pedersen2013-11-25
| | | | | | | | | If we store the peer link ID right after initializing a new neighbor, there is no need to do it later in the peering FSM. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: consolidate rcu unlocks in plink frame rxThomas Pedersen2013-11-25
| | | | | Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: factor peering frame processing into own functionThomas Pedersen2013-11-25
| | | | | Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: return -ENOMEM in mesh_plink_frame_txBob Copeland2013-11-25
| | | | | | | All other paths return an error code, do the same here. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh_plink: don't ignore holding timerBob Copeland2013-11-25
| | | | | | | | | | | | | | | | The ignore_plink_timer flag is set when doing mod_timer() if the timer was not previously active. This is to avoid executing the timeout if del_timer() was subsequently called. However, del_timer() only happens if we are moving to ESTAB state or get a close frame while in HOLDING. We cannot leave HOLDING and re-enter ESTAB unless we receive a close frame (in which case ignore_plink_timer is already set) or if the timeout expires, so there actually isn't a case where this is needed on mod_timer(). Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh_plink: collapse the two switch statements togetherBob Copeland2013-11-25
| | | | | | | | The matches_local check can just be done when looking at the individual action types. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh: rewrite rssi_threshold_check in CBob Copeland2013-11-25
| | | | | | | | Use C instead of cpp for type checking. Also swap the arguments into the usual sdata -> sta order. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh_plink: group basic fitness checksBob Copeland2013-11-25
| | | | | | | | | The initial frame checks differ depending on whether this is a new peer or not, but they were all intermixed with sta checks as necessary. Group them together so the two cases are clearer. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh: factor out common plink close/estab codeBob Copeland2013-11-25
| | | | | | | | | | Reject and accepted close events always put the host in the holding state and compute a reason code based only on the current state. Likewise on establish we always do the same setup. Put these in functions to save some duplicated code. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: hold sta->lock across plink switch statementsBob Copeland2013-11-25
| | | | | | | | Rather than unlock at the end of each case, do it once after all is said and done. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: consolidate calls to plink_frame_txThomas Pedersen2013-11-25
| | | | | | | | | | | | Do all frame transfers in one place at the end of the big switch statements. sta->plid and sta->reason can be passed in any case, since they are only used for the frames that need them. Remove assignments to locals for values already stored in the sta structure. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: fix off-by-one in llid check.Bob Copeland2013-11-25
| | | | | | | | | | According to IEEE 802.11-2012 (8.4.2.104), no peering management element exists with length 7. This code is checking to see if llid is present to ignore close frames with different llid, which would be IEs with length 8. Signed-off-by: Bob Copeland <bob@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: fixes for mesh powersave logicMarco Porsch2013-10-28
| | | | | | | | | | | | | | | | | | | | This patch fixes errors in the mesh powersave logic which cause that remote peers do not get peer power mode change notifications and mesh peer service periods (MPSPs) got stuck. When closing a peer link, set the (now invalid) peer-specific power mode to 'unknown'. Avoid overhead when local power mode is unchanged. Reliably clear MPSP flags on peering status update. Avoid MPSP flags getting stuck by not requesting a further MPSP ownership if we already are an MPSP owner. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: select and adjust bitrates according to channel modeSimon Wunderlich2013-07-16
| | | | | | | | | | | | | | | | The various components accessing the bitrates table must use consider the used channel bandwidth to select only available rates or calculate the bitrate correctly. There are some rates in reduced bandwidth modes which can't be represented as multiples of 500kbps, like 2.25 MBit/s in 5 MHz mode. The standard suggests to round up to the next multiple of 500kbps, just do that in mac80211 as well. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> [make rate unsigned in ieee80211_add_tx_radiotap_header(), squash fix] Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
* mac80211: fix various components for the new 5 and 10 MHz widthsSimon Wunderlich2013-06-18
| | | | | | | | | | | | This is a collection of minor fixes: * don't allow HT IEs in IBSS for 5/10 MHz * don't allow HT IEs in Mesh for 5/10 MHz * don't downgrade from/to 5 and 10 MHz channels * don't try HT rates for 5 and 10 MHz channels when selecting rates Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: fix mesh deadlockThomas Pedersen2013-06-11
| | | | | | | | | | | | | | | | The patch "cfg80211/mac80211: use cfg80211 wdev mutex in mac80211" introduced several deadlocks by converting the ifmsh->mtx to wdev->mtx. Solve these by: 1. drop the cancel_work_sync() in ieee80211_stop_mesh(). Instead make the mesh work conditional on whether the mesh is running or not. 2. lock the mesh work with sdata_lock() to protect beacon updates and prevent races with wdev->mesh_id_len or cfg80211. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* cfg80211/mac80211: use cfg80211 wdev mutex in mac80211Johannes Berg2013-05-24
| | | | | | | | | | | | | | | Using separate locks in cfg80211 and mac80211 has always caused issues, for example having to unlock in places in mac80211 to call cfg80211, which even needed a framework to make cfg80211 calls after some functions returned etc. Additionally, I suspect some issues people have reported with the cfg80211 state getting confused could be due to such issues, when cfg80211 is asking mac80211 to change state but mac80211 is in the process of telling cfg80211 that the state changed (in another way.) Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: parse VHT channel switch IEsJohannes Berg2013-04-16
| | | | | | | | | | | | | | VHT introduces multiple IEs that need to be parsed for a wide bandwidth channel switch. Two are (currently) needed in mac80211: * wide bandwidth channel switch element * channel switch wrapper element The former is contained in the latter for beacons and probe responses, but not for the spectrum management action frames so the IE parser needs a new argument to differentiate them. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: stringify another plink stateThomas Pedersen2013-04-10
| | | | | | | | The patch "mac80211: stringify mesh peering events" missed an opportunity to print the peering state as a string. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: init mesh timer for user authed STAsThomas Pedersen2013-03-06
| | | | | | | | | | | | | There is a corner case which wasn't being covered: userspace may authenticate and allocate stations, but still leave the peering up to the kernel. Initialize the peering timer if the MPM is not in userspace, in a path which is taken by both the kernel and userspace when allocating stations. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: support userspace MPMThomas Pedersen2013-03-06
| | | | | | | | | Earlier mac80211 would check whether some kind of mesh security was enabled, when the real question was "is the MPM in userspace"? Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: cleanup suspend/resume on mesh modeStanislaw Gruszka2013-03-06
| | | | | | | Remove not used any longer suspend/resume code. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: stringify mesh peering eventsThomas Pedersen2013-02-18
| | | | | | | | | | | Convert mesh peering events into strings and make the debug output a little easier to read. Also stop printing the llid and plid since these don't change across peering states and are random numbers anyway so they just amount to noise. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: clean up mesh HT operationThomas Pedersen2013-02-18
| | | | | | | | | | | | | | ieee80211_ht_cap_ie_to_sta_ht_cap() will clean up the ht_supported flag and station bandwidth field for us if the peer beacon doesn't have an HT capability element (is operating as non-HT). Also, we don't really need a special station ch_width member to track the station operating mode any more so use sta.bandwidth instead. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: clean up mesh codeJohannes Berg2013-02-15
| | | | | | | | | | | There's various code with strange indentation, questionable loop and locking constructs, etc. The bigger change is moving the "sdata" argument to the first argument of all functions, like all other mac80211 functions that have one. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: cache mesh beaconThomas Pedersen2013-02-15
| | | | | | | | | | | | | | Previously, the entire mesh beacon would be generated each time the beacon timer fired. Instead generate a beacon head and tail (so the TIM can easily be inserted when mesh power save is on) when starting a mesh or the MBSS parameters change. Also add a mutex for protecting beacon updates and preventing leaks. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: stop toggling IEEE80211_HT_CAP_SUP_WIDTH_20_40Johannes Berg2013-02-15
| | | | | | | | | | | | | | | | | | | | | | | | | For VHT, many more bandwidth changes are possible. As a first step, stop toggling the IEEE80211_HT_CAP_SUP_WIDTH_20_40 flag in the HT capabilities and instead introduce a bandwidth field indicating the currently usable bandwidth to transmit to the station. Of course, make all drivers use it. To achieve this, make ieee80211_ht_cap_ie_to_sta_ht_cap() get the station as an argument, rather than the new capabilities, so it can set up the new bandwidth field. If the station is a VHT station and VHT bandwidth is in use, also set the bandwidth accordingly. Doing this allows us to get rid of the supports_40mhz flag as the HT capabilities now reflect the true capability instead of the current setting. While at it, also fix ieee80211_ht_cap_ie_to_sta_ht_cap() to not ignore HT cap overrides when MCS TX isn't supported (not that it really happens...) Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: consolidate MBSS change notificationThomas Pedersen2013-02-15
| | | | | | | | | | | | A few mesh utility functions will call ieee80211_bss_info_change_notify(), and then the caller might notify the driver of the same change again. Avoid this redundancy by propagating the BSS changes and generally calling bss_info_change_notify() once per change. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: fix mesh sta teardownThomas Pedersen2013-02-11
| | | | | | | | | | | | | | | | | The patch "mac80211: clean up mesh sta allocation warning" moved some mesh initialization into a path which is only called when the kernel handles peering. This causes a hang when mac80211 tries to clean up a userspace-allocated station entry and delete a timer which has never been initialized. To avoid this, only do any mesh sta peering teardown if the kernel is actually handling it. The same is true when quiescing before suspend. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: stop plink timer only on mesh interfacesThomas Pedersen2013-02-05
| | | | | | | | | | | | | Since mesh_plink_quiesce() would unconditionally delete the plink timer, and the timer initialization was recently moved into the mesh code path, suspending with a non-mesh interface now causes a crash. Fix this by only deleting the plink timer for mesh interfaces. Reported-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Tested-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: mesh power save basicsMarco Porsch2013-02-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add routines to - maintain a PS mode for each peer and a non-peer PS mode - indicate own PS mode in transmitted frames - track neighbor STAs power modes - buffer frames when neighbors are in PS mode - add TIM and Awake Window IE to beacons - release frames in Mesh Peer Service Periods Add local_pm to sta_info to represent the link-specific power mode at this station towards the remote station. When a peer link is established, use the default power mode stored in mesh config. Update the PS status if the peering status of a neighbor changes. Maintain a mesh power mode for non-peer mesh STAs. Set the non-peer power mode to active mode during peering. Authenticated mesh peering is currently not working when either node is configured to be in power save mode. Indicate the current power mode in transmitted frames. Use QoS Nulls to indicate mesh power mode transitions. For performance reasons, calls to the function setting the frame flags are placed in HWMP routing routines, as there the STA pointer is already available. Add peer_pm to sta_info to represent the peer's link-specific power mode towards the local station. Add nonpeer_pm to represent the peer's power mode towards all non-peer stations. Track power modes based on received frames. Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS neighbor counter and group-addressed frame buffer). Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame buffering routines in the tx path. Update num_sta_ps to buffer and release group-addressed frames after DTIM beacons. Announce the awake window duration in beacons if in light or deep sleep mode towards any peer or non-peer. Create a TIM IE similarly to AP mode and add it to mesh beacons. Parse received Awake Window IEs and check TIM IEs for buffered frames. Release frames towards peers in mesh Peer Service Periods. Use the corresponding trigger frames and monitor the MPSP status. Append a QoS Null as trigger frame if neccessary to properly end the MPSP. Currently, in HT channels MPSPs behave imperfectly and show large delay spikes and frame losses. Signed-off-by: Marco Porsch <marco@cozybit.com> Signed-off-by: Ivan Bezyazychnyy <ivan.bezyazychnyy@gmail.com> Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: dynamic short slot time for MBSSsThomas Pedersen2013-01-29
| | | | | | | | | | | | | | The standard mandates mesh STAs to set the ERP Short Slot Time capability info bit in beacons to 0. Even though this is their way of disallowing short slot time for mesh STAs, there should be no harm in enabling it if we determine all STAs in the current MBSS support ERP rates. Increases throughput about 20% for legacy rates when enabled. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: fix mesh_sta_info_get() reshuffle damageThomas Pedersen2013-01-28
| | | | | | | | | | Before "mac80211: clean up mesh sta allocation warning" was applied, mesh_sta_info_get() was reshuffled to please sparse. As a result we neglect to initialize newly created STAs. Fix this. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: support mesh rate updatesThomas Pedersen2013-01-24
| | | | | | | | | | An existing mesh station entry may change its rate capabilities, so call rate_control_rate_update() to notify the rate control. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> [fix compilation] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: clean up mesh sta allocation warningThomas Pedersen2013-01-24
| | | | | | | | | | | | | | | This refactoring fixes a "scheduling while atomic" warning when allocating a mesh station entry while holding the RCU read lock. Fix this by creating a new function mesh_sta_info_get(), which correctly handles the locking and returns under RCU. Also move some unnecessarily #ifdefed mesh station init code from sta_info_alloc() to __mesh_sta_info_alloc(). Signed-off-by: Thomas Pedersen <thomas@cozybit.com> [change code flow to make sparse happy] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: update mesh peer link counter during userspace peeringMarco Porsch2013-01-16
| | | | | | | | | | The established peer link count is indicated in mesh beacons and used for other internal tasks. Previously it was not updated when authenticated peering is performed in userspace. Signed-off-by: Marco Porsch <marco@cozybit.com> Acked-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: don't reinit rate control when mesh sta existsHelmut Schaa2012-11-28
| | | | | | | | | | This fixes some unintended resets of the rate control statistics when minstrel_ht is used resulting in non-optimal throughput on mesh links. Tested-by: Emanuel Taube <emanuel.taube@gmail.com> Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: convert to channel definition structJohannes Berg2012-11-26
| | | | | | | | | | | | | | Convert mac80211 (and where necessary, some drivers a little bit) to the new channel definition struct. This will allow extending mac80211 for VHT, which is currently restricted to channel contexts since there are no drivers using that which makes it easier. As I also don't care about VHT for drivers not using the channel context API, I won't convert the previous API to VHT support. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: remove mesh config macros from mesh_plink.cMarco Porsch2012-11-26
| | | | | | | Use shortcut pointer instead where it is appropriate. Signed-off-by: Marco Porsch <marco.porsch@etit.tu-chemnitz.de> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: move out the non-statistics variable estab_plinks from mesh_statAshok Nagarajan2012-10-17
| | | | | | | | estab_plinks is not a statistics member. Hence move estab_plinks from struct mesh_stat to struct ieee80211_if_mesh Signed-off-by: Ashok Nagarajan <ashok@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: use channel contextsJohannes Berg2012-10-17
| | | | | | | | | | | | | | | | | | | | | | | | | Instead of operating on a single channel only, use the new channel context infrastructure in all mac80211 code. This enables drivers that want to use the new channel context infrastructure to use multiple channels, while nothing should change for all the other drivers that don't support it. Right now this disables both TX power settings and spatial multiplexing powersave. Both need to be re-enabled on a channel context basis. Additionally, when channel contexts are used drop the connection when channel switch is received rather than trying to handle it. This will have to be improved later. [With fixes from Eliad and Emmanuel incorporated] Signed-off-by: Eliad Peller <eliad@wizery.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* mac80211: allow re-open the blocked peer link in meshChun-Yeow Yeoh2012-09-14
| | | | | | | | | | | | | Peer link which is blocked using the "iw mesh0 station set <MAC addr> plink_action block" is previously not able to re-open using "iw mesh0 station set <MAC addr> plink_action open". This patch is intended to solve this. If the station plink state remains at OPN_SNT once open, try block and open again should solve this problem. Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* Merge branch 'for-john' of ↵John W. Linville2012-08-21
|\ | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next Conflicts: drivers/net/wireless/mac80211_hwsim.c
| * mac80211: mesh: don't use global channel typeJohannes Berg2012-08-20
| | | | | | | | | | | | | | | | | | | | | | | | | | Using local->_oper_channel_type in the mesh code is completely wrong as this value is the combination of the various interface channel types and can be a different value from the mesh interface in case there are multiple virtual interfaces. Use sdata->vif.bss_conf.channel_type instead as it tracks the per-vif channel type. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| * mac80211: skb leak in mesh_plink_frame_tx()Thomas Pedersen2012-08-03
| | | | | | | | | | | | | | | | | | Although adding an IE is almost guaranteed to succeed since we already accounted for its length while allocating the skb, we should still free the skb in case of failure. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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