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authorJohannes Berg <johannes@sipsolutions.net>2007-07-10 19:32:10 +0200
committerJohn W. Linville <linville@tuxdriver.com>2007-07-12 16:07:26 -0400
commit4480f15ca62a595248d6d8e2b3e75052113cde59 (patch)
treefec2e3536bbe508a6a5de4a1e14d0c0ac904836f /include/net
parent5558235c6bade6662e6f257a35f2dfdc8a742147 (diff)
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[PATCH] mac80211: clarify some mac80211 things
The semantics of not having an add_interface callback are not well defined, this callback is required because otherwise you cannot obtain the requested MAC address of the device. Change the documentation to reflect this, add a note about having no MAC address at all, add a warning that mac_addr in struct ieee80211_if_init_conf can be NULL and finally verify that a few callbacks are assigned by way of BUG_ON() Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/mac80211.h16
1 files changed, 12 insertions, 4 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 6278857..c34fd9a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -347,9 +347,16 @@ enum ieee80211_if_types {
* @mac_addr: pointer to MAC address of the interface. This pointer is valid
* until the interface is removed (i.e. it cannot be used after
* remove_interface() callback was called for this interface).
+ * This pointer will be %NULL for monitor interfaces, be careful.
*
* This structure is used in add_interface() and remove_interface()
* callbacks of &struct ieee80211_hw.
+ *
+ * When you allow multiple interfaces to be added to your PHY, take care
+ * that the hardware can actually handle multiple MAC addresses. However,
+ * also take care that when there's no interface left with mac_addr != %NULL
+ * you remove the MAC address from the device to avoid acknowledging packets
+ * in pure monitor mode.
*/
struct ieee80211_if_init_conf {
int if_id;
@@ -574,10 +581,11 @@ struct ieee80211_ops {
* to returning zero. By returning non-zero addition of the interface
* is inhibited. Unless monitor_during_oper is set, it is guaranteed
* that monitor interfaces and normal interfaces are mutually
- * exclusive. The open() handler is called after add_interface()
- * if this is the first device added. At least one of the open()
- * open() and add_interface() callbacks has to be assigned. If
- * add_interface() is NULL, one STA interface is permitted only. */
+ * exclusive. If assigned, the open() handler is called after
+ * add_interface() if this is the first device added. The
+ * add_interface() callback has to be assigned because it is the only
+ * way to obtain the requested MAC address for any interface.
+ */
int (*add_interface)(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf);