package/hostapd/patches/420-stbc_fix_backport.patch

   1 From: Helmut Schaa <helmut.schaa@googlemail.com>
   2 Date: Sat, 28 Aug 2010 09:25:44 +0000 (+0300)
   3 Subject: hostapd: enable STBC only for STBC capable STAs
   4 X-Git-Url: http://hostap.epitest.fi/gitweb/gitweb.cgi?p=hostap.git;a=commitdiff_plain;h=36af1c7d31bdc5ba4dacacbf32d3c7585665ae2b
   5
   6 hostapd: enable STBC only for STBC capable STAs
   7
   8 hostapd simply used its own STBC configuration in the STA's HT caps. This
   9 resulted in TX STBC being used for STAs not supporting RX STBC, which in
  10 turn resulted in the STA not receiving anything.
  11
  12 Fix this by handling the STBC flags in the same way mac80211 does. Mask
  13 out RX STBC if we don't support TX STBC and vice versa.
  14
  15 Tested only with the nl80211 driver and a STBC incapable STA.
  16
  17 Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
  18 ---
  19
  20 diff --git a/src/ap/ieee802_11_ht.c b/src/ap/ieee802_11_ht.c
  21 index 1b39a6a..b193ee0 100644
  22 --- a/src/ap/ieee802_11_ht.c
  23 +++ b/src/ap/ieee802_11_ht.c
  24 @@ -256,7 +256,15 @@ void hostapd_get_ht_capab(struct hostapd_data *hapd,
  25         cap &= hapd->iconf->ht_capab;
  26         cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_DISABLED);
  27
  28 -       /* FIXME: Rx STBC needs to be handled specially */
  29 -       cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK);
  30 +       /*
  31 +        * STBC needs to be handled specially
  32 +        * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
  33 +        * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
  34 +        */
  35 +       if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
  36 +               cap &= ~HT_CAP_INFO_TX_STBC;
  37 +       if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
  38 +               cap &= ~HT_CAP_INFO_RX_STBC_MASK;
  39 +
  40         neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
  41  }