patches/0002-disable-dump-adjust-on-old-kernels.patch

   1 On older kernels, we can't do this workaround, so if you use
   2 an old 64-bit kernel with compat you'd better upgrade.
   3
   4 For more details of this work around refer to this commit
   5 upstream that deals with the code added:
   6
   7 commit 645e77def93f1dd0e211c7244fbe152dac8a7100
   8 Author: Johannes Berg <johannes.berg@intel.com>
   9 Date:   Fri Mar 1 14:03:49 2013 +0100
  10
  11     nl80211: increase wiphy dump size dynamically
  12
  13     Given a device with many channels capabilities the wiphy
  14     information can still overflow even though its size in
  15     3.9 was reduced to 3.8 levels. For new userspace and
  16     kernel 3.10 we're going to implement a new "split dump"
  17     protocol that can use multiple messages per wiphy.
  18
  19     For now though, add a workaround to be able to send more
  20     information to userspace. Since generic netlink doesn't
  21     have a way to set the minimum dump size globally, and we
  22     wouldn't really want to set it globally anyway, increase
  23     the size only when needed, as described in the comments.
  24     As userspace might not be prepared for large buffers, we
  25     can only use 4k.
  26
  27     Also increase the size for the get_wiphy command.
  28
  29 --- a/net/wireless/nl80211.c
  30 +++ b/net/wireless/nl80211.c
  31 @@ -2010,6 +2010,7 @@ static int nl80211_dump_wiphy(struct sk_
  32                                                  cb->nlh->nlmsg_seq,
  33                                                  NLM_F_MULTI, state);
  34                         if (ret < 0) {
  35 +#if LINUX_VERSION_IS_GEQ(3,1,0)
  36                                 /*
  37                                  * If sending the wiphy data didn't fit (ENOBUFS
  38                                  * or EMSGSIZE returned), this SKB is still
  39 @@ -2031,6 +2032,7 @@ static int nl80211_dump_wiphy(struct sk_
  40                                         rtnl_unlock();
  41                                         return 1;
  42                                 }
  43 +#endif
  44                                 idx--;
  45                                 break;
  46                         }