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authorGertjan van Wingerde <gwingerde@gmail.com>2009-12-04 23:46:54 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-12-14 14:22:31 -0500
commitd24deb2580823ab0b8425790c6f5d18e2ff749d8 (patch)
treee19fa93ccf306ea54508492a141721a1e4cc3a30 /net/mac80211
parentb2ec153a637409bd87952d44409905b7d98418b8 (diff)
downloadop-kernel-dev-d24deb2580823ab0b8425790c6f5d18e2ff749d8.zip
op-kernel-dev-d24deb2580823ab0b8425790c6f5d18e2ff749d8.tar.gz
mac80211: Add define for TX headroom reserved by mac80211 itself.
Add a definition of the amount of TX headroom reserved by mac80211 itself for its own purposes. Also add BUILD_BUG_ON to validate the value. This define can then be used by drivers to request additional TX headroom in the most efficient manner. Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 8116d1a..0d2d948 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -515,6 +515,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
* and we need some headroom for passing the frame to monitor
* interfaces, but never both at the same time.
*/
+ BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
+ sizeof(struct ieee80211_tx_status_rtap_hdr));
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
sizeof(struct ieee80211_tx_status_rtap_hdr));
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