mac80211: allow configure_filter callback to sleep

Over time, a whole bunch of drivers have come up
with their own scheme to delay the configure_filter
operation to a workqueue. To be able to simplify
things, allow configure_filter to sleep, and add
a new prepare_multicast callback that drivers that
need the multicast address list implement. This new
callback must be atomic, but most drivers either
don't care or just calculate a hash which can be
done atomically and then uploaded to the hardware
non-atomically.

A cursory look suggests that at76c50x-usb, ar9170,
mwl8k (which is actually very broken now), rt2x00,
wl1251, wl1271 and zd1211 should make use of this
new capability.

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

2 files changed, 18 insertions, 4 deletions

diff --git a/drivers/net/wireless/rtl818x/rtl8180_dev.c b/drivers/net/wireless/rtl818x/rtl8180_dev.c
index 09f46abc730..16429c49139 100644
--- a/drivers/net/wireless/rtl818x/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8180_dev.c
@@ -728,10 +728,16 @@ static void rtl8180_bss_info_changed(struct ieee80211_hw *dev,
 	        priv->rf->conf_erp(dev, info);
 }
 
+static u64 rtl8180_prepare_multicast(struct ieee80211_hw *dev, int mc_count,
+				     struct dev_addr_list *mc_list)
+{
+	return mc_count;
+}
+
 static void rtl8180_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_addr_list *mclist)
+				     u64 multicast)
 {
 	struct rtl8180_priv *priv = dev->priv;
 
@@ -741,7 +747,7 @@ static void rtl8180_configure_filter(struct ieee80211_hw *dev,
 		priv->rx_conf ^= RTL818X_RX_CONF_CTRL;
 	if (changed_flags & FIF_OTHER_BSS)
 		priv->rx_conf ^= RTL818X_RX_CONF_MONITOR;
-	if (*total_flags & FIF_ALLMULTI || mc_count > 0)
+	if (*total_flags & FIF_ALLMULTI || multicast > 0)
 		priv->rx_conf |= RTL818X_RX_CONF_MULTICAST;
 	else
 		priv->rx_conf &= ~RTL818X_RX_CONF_MULTICAST;
@@ -768,6 +774,7 @@ static const struct ieee80211_ops rtl8180_ops = {
 	.remove_interface	= rtl8180_remove_interface,
 	.config			= rtl8180_config,
 	.bss_info_changed	= rtl8180_bss_info_changed,
+	.prepare_multicast	= rtl8180_prepare_multicast,
 	.configure_filter	= rtl8180_configure_filter,
 };
 
diff --git a/drivers/net/wireless/rtl818x/rtl8187_dev.c b/drivers/net/wireless/rtl818x/rtl8187_dev.c
index 53f57dc5222..90f38357393 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_dev.c
@@ -1192,10 +1192,16 @@ static void rtl8187_bss_info_changed(struct ieee80211_hw *dev,
 				 info->use_short_preamble);
 }
 
+static u64 rtl8187_prepare_multicast(struct ieee80211_hw *dev,
+				     int mc_count, struct dev_addr_list *mc_list)
+{
+	return mc_count;
+}
+
 static void rtl8187_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_addr_list *mclist)
+				     u64 multicast)
 {
 	struct rtl8187_priv *priv = dev->priv;
 
@@ -1205,7 +1211,7 @@ static void rtl8187_configure_filter(struct ieee80211_hw *dev,
 		priv->rx_conf ^= RTL818X_RX_CONF_CTRL;
 	if (changed_flags & FIF_OTHER_BSS)
 		priv->rx_conf ^= RTL818X_RX_CONF_MONITOR;
-	if (*total_flags & FIF_ALLMULTI || mc_count > 0)
+	if (*total_flags & FIF_ALLMULTI || multicast > 0)
 		priv->rx_conf |= RTL818X_RX_CONF_MULTICAST;
 	else
 		priv->rx_conf &= ~RTL818X_RX_CONF_MULTICAST;
@@ -1268,6 +1274,7 @@ static const struct ieee80211_ops rtl8187_ops = {
 	.remove_interface	= rtl8187_remove_interface,
 	.config			= rtl8187_config,
 	.bss_info_changed	= rtl8187_bss_info_changed,
+	.prepare_multicast	= rtl8187_prepare_multicast,
 	.configure_filter	= rtl8187_configure_filter,
 	.conf_tx		= rtl8187_conf_tx
 };