mac80211: remove HW_SIGNAL_DB

Giving the signal in dB isn't much more useful to userspace
than giving the signal in unspecified units. This removes
some radiotap information for zd1211 (the only driver using
this flag), but it helps a lot for getting cfg80211-based
scanning which won't support dB, and zd1211 being dB is a
little fishy anyway.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Bruno Randolf <bruno@thinktube.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 11 insertions, 28 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index a611ad857983..651807dfb508 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -967,7 +967,7 @@ struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &mac->band;
 
         hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
-                    IEEE80211_HW_SIGNAL_DB;
+                    IEEE80211_HW_SIGNAL_UNSPEC;
 
         hw->wiphy->interface_modes =
                 BIT(NL80211_IFTYPE_MESH_POINT) |
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index e2144f0e8728..409e2c69269d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -860,11 +860,6 @@ enum ieee80211_tkip_key_type {
  *      expect values between 0 and @max_signal.
  *      If possible please provide dB or dBm instead.
  *
- * @IEEE80211_HW_SIGNAL_DB:
- *      Hardware gives signal values in dB, decibel difference from an
- *      arbitrary, fixed reference. We expect values between 0 and @max_signal.
- *      If possible please provide dBm instead.
- *
  * @IEEE80211_HW_SIGNAL_DBM:
  *      Hardware gives signal values in dBm, decibel difference from
  *      one milliwatt. This is the preferred method since it is standardized
@@ -900,15 +895,14 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE          = 1<<3,
         IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE      = 1<<4,
         IEEE80211_HW_SIGNAL_UNSPEC                      = 1<<5,
-        IEEE80211_HW_SIGNAL_DB                          = 1<<6,
-        IEEE80211_HW_SIGNAL_DBM                         = 1<<7,
-        IEEE80211_HW_NOISE_DBM                          = 1<<8,
-        IEEE80211_HW_SPECTRUM_MGMT                      = 1<<9,
-        IEEE80211_HW_AMPDU_AGGREGATION                  = 1<<10,
-        IEEE80211_HW_SUPPORTS_PS                        = 1<<11,
-        IEEE80211_HW_PS_NULLFUNC_STACK                  = 1<<12,
-        IEEE80211_HW_SUPPORTS_DYNAMIC_PS                = 1<<13,
-        IEEE80211_HW_MFP_CAPABLE                        = 1<<14,
+        IEEE80211_HW_SIGNAL_DBM                         = 1<<6,
+        IEEE80211_HW_NOISE_DBM                          = 1<<7,
+        IEEE80211_HW_SPECTRUM_MGMT                      = 1<<8,
+        IEEE80211_HW_AMPDU_AGGREGATION                  = 1<<9,
+        IEEE80211_HW_SUPPORTS_PS                        = 1<<10,
+        IEEE80211_HW_PS_NULLFUNC_STACK                  = 1<<11,
+        IEEE80211_HW_SUPPORTS_DYNAMIC_PS                = 1<<12,
+        IEEE80211_HW_MFP_CAPABLE                        = 1<<13,
 };
 
 /**
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index a109c06e8e4e..7247b303e966 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -884,7 +884,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 
         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
-                                                  IEEE80211_HW_SIGNAL_DB |
                                                   IEEE80211_HW_SIGNAL_DBM) ?
                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 1a59382976e6..8e8ddbfcd236 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -86,8 +86,7 @@ ieee80211_rx_radiotap_len(struct ieee80211_local *local,
 
         if (status->flag & RX_FLAG_TSFT)
                 len += 8;
-        if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
-            local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
+        if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
                 len += 1;
         if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
                 len += 1;
@@ -199,14 +198,6 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
         *pos = status->antenna;
         pos++;
 
-        /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
-        if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
-                *pos = status->signal;
-                rthdr->it_present |=
-                        cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
-                pos++;
-        }
-
         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
 
         /* IEEE80211_RADIOTAP_RX_FLAGS */
diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index 5c88b8246bbb..bad1cfbfdf18 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -173,8 +173,7 @@ static int ieee80211_ioctl_giwrange(struct net_device *dev,
         range->num_encoding_sizes = 2;
         range->max_encoding_tokens = NUM_DEFAULT_KEYS;
 
-        if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC ||
-            local->hw.flags & IEEE80211_HW_SIGNAL_DB)
+        if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
                 range->max_qual.level = local->hw.max_signal;
         else if  (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
                 range->max_qual.level = -110;