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* mac80211: make uapsd_* keys per-vifEliad Peller2012-03-151-2/+2
| | | | | | | | | | | uapsd_queues and uapsd_max_sp_len are relevant only for managed interfaces, and can be configured differently for each vif. Move them from the local struct to sdata->u.mgd, and update the debugfs functions accordingly. Signed-off-by: Eliad Peller <eliad@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Limit TID buffering during BA session setup/teardownHelmut Schaa2012-03-121-0/+6
| | | | | | | | | | | | | | | While setting up or tearing down a BA session mac80211 is buffering pending frames for the according TID. However, there's currently no limit on how many frames are buffered possibly leading to an out-of- memory situation. This can happen on systems with little memory when the CPU is fully loaded since the BA session work is executed in process context while frames can still come via softirq. Apply a limitation to the TIDs pending queue to avoid consuming too much memory in this situation. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: handle non-bufferable MMPDUs correctlyJohannes Berg2012-02-291-6/+11
| | | | | | | | | | | | | | | This renames the IEEE80211_TX_CTL_POLL_RESPONSE TX flag to IEEE80211_TX_CTL_NO_PS_BUFFER and also uses it for non-bufferable MMPDUs (all MMPDUs but deauth, disassoc and action frames.) Previously, mac80211 would let the MMPDU through but not set the flag so drivers supporting some hardware aids for avoiding the PS races would then reject the frame. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: remove local_to_hwJohannes Berg2012-02-271-1/+1
| | | | | | | | That's a lot longer than open-coding it and doesn't really add value, so just remove it. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* cfg80211: restructure AP/GO mode APIJohannes Berg2012-02-221-5/+8
| | | | | | | | | | | | | | | | | | | | | | | | The AP/GO mode API isn't very clearly defined, it has "set beacon" and "new beacon" etc. Modify the API to the following: * start AP -- all settings * change beacon -- new beacon data * stop AP -- stop AP mode operation This also reflects in the nl80211 API, rename the commands there correspondingly (but keep the old names for compatibility.) Overall, this makes it much clearer what's going on in the API. Kalle developed the ath6kl changes, I created the rest of the patch. Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: add support for mcs masksSimon Wunderlich2012-01-301-0/+5
| | | | | | | | | | | * Handle MCS masks set by the user. * Match rates provided by the rate control algorithm to the mask set, also in HT mode, and switch back to legacy mode if necessary. * add debugfs files to observate the rate selection Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: fix tx->skb NULL pointer dereferenceYoni Divinsky2012-01-161-9/+1
| | | | | | | | | | In function ieee80211_tx_h_encrypt the var info was initialized from tx->skb, since the fucntion is called after the function ieee80211_tx_h_fragment tx->skb is not valid anymore. Signed-off-by: Yoni Divinsky <yoni.divinsky@ti.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Use appropriate TID for sending BAR, ADDBA and DELBA framesHelmut Schaa2011-12-151-4/+4
| | | | | | | | | | | | | Currently BAR, ADDBA and DELBA frames are always sent using AC_VO. If the TID for which a BA session is established is assigned to a different queue BAR, ADDBA and DELBA frames can "overtake" frames of the according BA session. Hence, always put BA session related frames into the same queue as the BA sessions data frames. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: reduce station management complexityJohannes Berg2011-12-151-2/+2
| | | | | | | | | | | | | Now that IBSS no longer needs to insert stations from atomic context, we can get rid of all the special cases for that, and even get rid of the sta_lock (though it needs to stay as tim_lock.) This makes the station management code much more straight-forward. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: count authorized stations per BSSJohannes Berg2011-12-151-11/+8
| | | | | | | | | | | | | | Currently, each AP interface will send multicast traffic if any interface has a station entry even if that station entry is allocated only. With the new station state management we can easily fix it by adding a counter that counts each authorized station only and send multicast traffic only when the correct interface has at least one authorized station. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: refactor station state transitionsJohannes Berg2011-12-151-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | Station entries can have various states, the most important ones being auth, assoc and authorized. This patch prepares us for telling the driver about these states, we don't want to confuse drivers with strange transitions, so with this we enforce that they move in the right order between them (back and forth); some transitions might happen before the driver even knows about the station, but at least runtime transitions will be ordered correctly. As a consequence, IBSS and MESH stations will now have the ASSOC flag set (so they can transition to AUTHORIZED), and we can get rid of a special case in TX processing. When freeing a station, unwind the state so that other parts of the code (or drivers later) can rely on the transitions. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: fix retransmitJohannes Berg2011-12-061-1/+4
| | | | | | | | | | | | | This fixes another regression from my "pass all fragments to driver at once" patches -- if the packet is being retransmitted then we don't go through all handlers, but we still need to move it to the skbs list, otherwise we run into the first warning in __ieee80211_tx() and leak the skb. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: don't initiate path discovery when forwarding frame with unknown DAThomas Pedersen2011-11-281-1/+1
| | | | | | | | | | | | | We used to initiate a path discovery when receiving a frame for which there is no forwarding information. To cut down on PREQ spam, just send a (gated) PERR in response. Also separate path discovery logic from nexthop querying. This patch means we no longer queue frames when forwarding, so kill the PERR TX stuff in discard_frame(). Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* {nl,cfg,mac}80211: Allow Setting Multicast Rate in MeshChun-Yeow Yeoh2011-11-281-0/+1
| | | | | | Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com> Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: call skb_put() before copying the data (trivial)Eliad Peller2011-11-281-1/+1
| | | | | | | | It doesn't have any actual effect here, but we should skb_put() *before* copying the data. Signed-off-by: Eliad Peller <eliad@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: fix TX warningJohannes Berg2011-11-281-3/+4
| | | | | | | | | | | | | | | | | | | | Emmanuel reported that my previous patches to enable handing all fragments to drivers at once triggered the warning that the SKB queue wasn't empty. This is happening when we actually queue up some frames and don't hand them to the driver (queues are stopped). The reason for it is that my code that splices the frame(s) over to the pending queue didn't re-init the local queue, so skb_queue_empty() was false. Fix this by using the _init versions of the splicing. Also, convert the warning to WARN_ON_ONCE. Reported-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Tested-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: timeout tx agg sessions in way similar to rx agg sessionsNikolay Martynov2011-11-281-0/+8
| | | | | | | | | | | | | | | Currently tx aggregation is not being timed out even if timeout is specified when aggregation is opened. Tx tid stays active until delba arrives from recipient (i.e. recipient times out tid when it is inactive). The problem with this approach is that delba can get lost in the air and tx tid will stay perpetually opened on the originator while closed on recipient thus all data sent via this tid will be lost. This patch implements tx tid timeouting in way very similar to rx tid timeouting. Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: fix duration calculation for QoS NOACK framesSimon Wunderlich2011-11-281-5/+9
| | | | | | Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: remove debugfs noack testSimon Wunderlich2011-11-281-9/+1
| | | | | | | | This feature has been superseded by the NoAck per Queue feature. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* Merge branch 'master' of ↵John W. Linville2011-11-221-0/+1
|\ | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux Conflicts: drivers/net/wireless/iwlegacy/iwl-debugfs.c drivers/net/wireless/iwlegacy/iwl-rx.c drivers/net/wireless/iwlegacy/iwl-scan.c drivers/net/wireless/iwlegacy/iwl-tx.c include/net/bluetooth/bluetooth.h
| * net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modulesPaul Gortmaker2011-10-311-0/+1
| | | | | | | | | | | | | | | | | | These files are non modular, but need to export symbols using the macros now living in export.h -- call out the include so that things won't break when we remove the implicit presence of module.h from everywhere. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* | mac80211: transmit fragment list to driversJohannes Berg2011-11-211-34/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Drivers can usually handle fragmented packets much easier when they get the entire list of fragments at once. The only thing they need to do is keep enough space on the queues for up to ten fragments of a single MSDU. This allows them to implement this with a new operation tx_frags. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: make TX LED handling independent of fragmentationJohannes Berg2011-11-211-12/+16
| | | | | | | | | | | | | | | | | | | | This just prepares for passing the entire fragment list to the driver. No significant changes, but the TX throughput is calculated slightly differently now and we blink only once for each MSDU. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: move fragment flag adjustmentJohannes Berg2011-11-211-9/+9
| | | | | | | | | | | | | | | | Instead of adjusting the fragment flags at TX time, adjust them at fragmentation time. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: use skb list for fragmentsJohannes Berg2011-11-211-56/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | We are currently linking the skbs by using skb->next directly. This works, but the preferred way is to use a struct sk_buff_head instead. That also prepares for passing that to drivers directly. While at it I noticed we calculate the duration for fragments twice -- remove one of them. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: remove crypto special case for auth framesJohannes Berg2011-11-171-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The shared key authentication frame that needs to be encrypted (the third one in the shared key handshake) is directly encrypted in ieee80211_send_auth and the IEEE80211_TX_INTFL_DONT_ENCRYPT is set. All others are not encrypted, so the only way to get to this is erroneously on no-monitor AP side. Remove the special case for authentication frames to fix the AP shared key side when operating without cooked monitor interfaces -- with cooked monitor the IEEE80211_TX_INTFL_DONT_ENCRYPT also gets set, so we never get here -- an AP never encrypts auth frames. Without this patch, an AP operating in WEP mode with my no-monitor patches would erroneously encrypt all authentication frames, instead of none. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: Save probe response data for bssArik Nemtsov2011-11-111-0/+31
| | | | | | | | | | | | | | | | | | | | | | | | Allow setting a probe response template for an interface operating in AP mode. Low level drivers are notified about changes in the probe response template and are able to retrieve a copy of the current probe response. This data can, for example, be uploaded to hardware as a template. Signed-off-by: Guy Eilam <guy@wizery.com> Signed-off-by: Arik Nemtsov <arik@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: implement wifi TX statusJohannes Berg2011-11-091-3/+53
| | | | | | | | | | | | | | | | Implement the socket wifi TX status error queue reflection in mac80211. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: add HT IEs to mesh framesThomas Pedersen2011-11-081-0/+4
| | | | | | | | | | | | Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Ashok Nagarajan <anagar6@uic.edu> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* | mac80211: comment allocation of mesh framesThomas Pedersen2011-11-081-6/+13
|/ | | | | | | | Remove most references to magic numbers, save a few bytes and hopefully improve readability. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: reformat TX unauthorised checkJohannes Berg2011-10-141-5/+4
| | | | | | | | | Reformat the check, the indentation is completely strange. Also change the last part of the condition to make the code shorter. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: dont orphan TX skbJohannes Berg2011-10-111-5/+0
| | | | | | | | | | | | | | | | | This was another workaround for truesize "bugs". The reason we did this was that when we orphaned the SKB it wouldn't be truesize-checked later. Now that the check is gone (and we just charge the former smaller size to the socket) there's no longer a reason to orphan the skb here. Keep the skb charged to the socket until it is really freed (or orphaned in TX status). This helps flow control and allows us to get at the socket later for other purposes. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: dont adjust truesizeJohannes Berg2011-10-111-3/+0
| | | | | | | | | | | | | | | | There's no need to adjust truesize. The history of this was that we always ran into skb_truesize_bug (via skb_truesize_check) which has since been removed in commit 92a0acce186cd. skb_truesize_check() checked that truesize was bigger or equal to the actual allocation, which would trigger in mac80211 due to header adding. The check no longer exists and we shouldn't be messing with the truesize anwyay. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: parse radiotap header earlierJohannes Berg2011-10-111-113/+88
| | | | | | | | | | | We can now move the radiotap header parsing into ieee80211_monitor_start_xmit(). This moves it out of the hotpath, and also helps the code since now the radiotap header will no longer be present in ieee80211_xmit() etc. which is easier to understand. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: move fragment flag to info flag as dont-fragmentJohannes Berg2011-10-111-25/+14
| | | | | | | | | | | | | The purpose of this is two-fold: 1) by moving it out of tx_data.flags, we can in another patch move the radiotap parsing so it no longer is in the hotpath 2) if a device implements fragmentation but can optionally skip it, the radiotap request for not doing fragmentation may be honoured Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: remove tx_data ethertypeJohannes Berg2011-10-111-6/+1
| | | | | | | It's set, but never used, so kill it. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: optimise monitor xmitJohannes Berg2011-10-111-59/+49
| | | | | | | | | | Since the only way the interface can be a monitor interface in ieee80211_xmit() is because the frame came from ieee80211_monitor_start_xmit() we can move all the code there. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Allow noack flag overwrite for injected framesHelmut Schaa2011-10-031-2/+13
| | | | | | | | Allow injected unicast frames to be sent without having to wait for an ACK. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: dont assign seqno to or aggregate QoS Null framesJohannes Berg2011-09-301-0/+4
| | | | | | | | | | | | | | | | 802.11 says: "Sequence numbers for QoS (+)Null frames may be set to any value." However, if we use the normal counters then peers will get confused with aggregation since there'll be holes in the sequence number sequence. To avoid that, neither assign a sequence number to QoS null frames nor put them on aggregation. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: optimise station flagsJohannes Berg2011-09-301-30/+38
| | | | | | | | | | | | | | | | | | | | The flaglock in struct sta_info has long been something that I wanted to get rid of, this finally does the conversion to atomic bitops. The conversion itself is straight-forward in most places, a few things needed to change a bit since we can no longer use multiple bits at the same time. On x86-64, this is a fairly significant code size reduction: text data bss dec hex 427861 23648 1008 452517 6e7a5 before 425383 23648 976 450007 6ddd7 after Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: send (QoS) Null if no buffered framesJohannes Berg2011-09-301-2/+1
| | | | | | | | | | | | | For PS-poll, there's a possible race between us expiring a frame and the station polling for it -- send it a null frame in that case. For uAPSD, the standard says that we have to send a frame in each SP, so send null if we don't have any other frames. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: implement uAPSDJohannes Berg2011-09-301-4/+4
| | | | | | | | | | | | | | | | | | | Add uAPSD support to mac80211. This is probably not possible with all devices, so advertising it with the cfg80211 flag will be left up to drivers that want it. Due to my previous patches it is now a fairly straight-forward extension. Drivers need to have accurate TX status reporting for the EOSP frame. For drivers that buffer themselves, the provided APIs allow releasing the right number of frames, but then drivers need to set EOSP and more-data themselves. This is documented in more detail in the new code itself. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: split PS buffers into ACsJohannes Berg2011-09-301-17/+25
| | | | | | | | | | | | | | | | | For uAPSD support we'll need to have per-AC PS buffers. As this is a major undertaking, split the buffers before really adding support for uAPSD. This already makes some reference to the uapsd_queues variable, but for now that will never be non-zero. Since book-keeping is complicated, also change the logic for keeping a maximum of frames only and allow 64 frames per AC (up from 128 for a station). Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: unify TIM bit handlingJohannes Berg2011-09-301-9/+6
| | | | | | | | | | | | Currently, the TIM bit for a given station is set and cleared all over the place. Since the logic to set/clear it will become much more complex when we add uAPSD support, as a first step let's collect the entire logic in one place. This requires a few small adjustments to other places. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: data path modification for TDLS peersArik Nemtsov2011-09-301-4/+38
| | | | | | | | | | | | | | | | | | | Mark the STA entries of enabled TDLS peers with a new "peer authorized" flag. During link setup, allow special TDLS setup frames through the AP, but otherwise drop all packets destined to the peer. This is required by the TDLS (802.11z) specification in order to prevent reordering of MSDUs between the AP and direct paths. When setup completes and the peer is authorized, send data directly, bypassing the AP. In the Rx path, allow data to be received directly from TDLS peers. Signed-off-by: Arik Nemtsov <arik@wizery.com> Cc: Kalyan C Gaddam <chakkal@iit.edu> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: standardize adding supported rates IEsArik Nemtsov2011-09-301-2/+2
| | | | | | | | | Relocate the mesh implementation of adding the (extended) supported rates IE to util.c, anticipating its use by other parts of mac80211. Signed-off-by: Arik Nemtsov <arik@wizery.com> Cc: Kalyan C Gaddam <chakkal@iit.edu> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Mesh data frames must have the QoS headerJavier Cardona2011-09-141-1/+1
| | | | | | | | Per sec 7.1.3.5 of draft 12.0 of 802.11s, mesh frames indicate the presence of the mesh control header in their QoS header. Signed-off-by: Javier Cardona <javier@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Start implementing QoS support for mesh interfacesJavier Cardona2011-09-141-0/+4
| | | | | | | | | | | | | In order to support QoS in mesh, we need to assign queue mapping only after the next hop has been resolved, both for forwarded and locally originated frames. Also, now that this is fixed, remove the XXX comment in ieee80211_select_queue(). Also, V-Shy Ho reported that the queue mapping was not being applied to the forwarded frame (fwd_skb instead of skb). Fixed that as well. Signed-off-by: Javier Cardona <javier@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: add flag to indicate HW only Tx-agg setup supportArik Nemtsov2011-09-131-1/+2
| | | | | | | | | When this flag is set, Tx A-MPDU sessions will not be started by mac80211. This flag is required for devices that support Tx A-MPDU setup in hardware. Signed-off-by: Arik Nemtsov <arik@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: Remove unnecessary OOM logging messagesJoe Perches2011-09-131-12/+5
| | | | | | | | | | | Removing unnecessary messages saves code and text. Site specific OOM messages are duplications of a generic MM out of memory message and aren't really useful, so just delete them. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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