cfg80211: mlme API must be able to sleep

After the mac80211 mlme cleanup, we can require that
the MLME functions in cfg80211 can sleep. This will
simplify future work in cfg80211 a lot.

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

3 files changed, 56 insertions, 51 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index fe49833242d7..60c1f11da45f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1721,70 +1721,68 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
  * @dev: network device
  * @buf: authentication frame (header + body)
  * @len: length of the frame data
- * @gfp: allocation flags
  *
  * This function is called whenever an authentication has been processed in
  * station mode. The driver is required to call either this function or
  * cfg80211_send_auth_timeout() to indicate the result of cfg80211_ops::auth()
- * call.
+ * call. This function may sleep.
  */
-void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp);
+void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
 
 /**
  * cfg80211_send_auth_timeout - notification of timed out authentication
  * @dev: network device
  * @addr: The MAC address of the device with which the authentication timed out
- * @gfp: allocation flags
+ *
+ * This function may sleep.
  */
-void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr, gfp_t gfp);
+void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr);
 
 /**
  * cfg80211_send_rx_assoc - notification of processed association
  * @dev: network device
  * @buf: (re)association response frame (header + body)
  * @len: length of the frame data
- * @gfp: allocation flags
  *
  * This function is called whenever a (re)association response has been
  * processed in station mode. The driver is required to call either this
  * function or cfg80211_send_assoc_timeout() to indicate the result of
- * cfg80211_ops::assoc() call.
+ * cfg80211_ops::assoc() call. This function may sleep.
  */
-void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp);
+void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len);
 
 /**
  * cfg80211_send_assoc_timeout - notification of timed out association
  * @dev: network device
  * @addr: The MAC address of the device with which the association timed out
- * @gfp: allocation flags
+ *
+ * This function may sleep.
  */
-void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr, gfp_t gfp);
+void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr);
 
 /**
  * cfg80211_send_deauth - notification of processed deauthentication
  * @dev: network device
  * @buf: deauthentication frame (header + body)
  * @len: length of the frame data
- * @gfp: allocation flags
  *
  * This function is called whenever deauthentication has been processed in
  * station mode. This includes both received deauthentication frames and
- * locally generated ones.
+ * locally generated ones. This function may sleep.
  */
-void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp);
+void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len);
 
 /**
  * cfg80211_send_disassoc - notification of processed disassociation
  * @dev: network device
  * @buf: disassociation response frame (header + body)
  * @len: length of the frame data
- * @gfp: allocation flags
  *
  * This function is called whenever disassociation has been processed in
  * station mode. This includes both received disassociation frames and locally
- * generated ones.
+ * generated ones. This function may sleep.
  */
-void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp);
+void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len);
 
 /**
  * cfg80211_michael_mic_failure - notification of Michael MIC failure (TKIP)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 108e8c9c60fd..15dbb57ab55e 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -412,11 +412,9 @@ static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 
         if (stype == IEEE80211_STYPE_DEAUTH)
-                cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len,
-                                     GFP_KERNEL);
+                cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
         else
-                cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len,
-                                       GFP_KERNEL);
+                cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 }
 
@@ -1839,12 +1837,10 @@ static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                         /* no action */
                         break;
                 case RX_MGMT_CFG80211_DEAUTH:
-                        cfg80211_send_deauth(sdata->dev, (u8 *) mgmt,
-                                             skb->len, GFP_KERNEL);
+                        cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
                         break;
                 case RX_MGMT_CFG80211_DISASSOC:
-                        cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt,
-                                               skb->len, GFP_KERNEL);
+                        cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
                         break;
                 default:
                         WARN(1, "unexpected: %d", rma);
@@ -1893,12 +1889,10 @@ static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                 /* no action */
                 break;
         case RX_MGMT_CFG80211_AUTH:
-                cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len,
-                                      GFP_KERNEL);
+                cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
                 break;
         case RX_MGMT_CFG80211_ASSOC:
-                cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len,
-                                       GFP_KERNEL);
+                cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
                 break;
         default:
                 WARN(1, "unexpected: %d", rma);
@@ -2026,13 +2020,11 @@ static void ieee80211_sta_work(struct work_struct *work)
                 switch (wk->tries) {
                 case RX_MGMT_CFG80211_AUTH_TO:
                         cfg80211_send_auth_timeout(sdata->dev,
-                                                   wk->bss->cbss.bssid,
-                                                   GFP_KERNEL);
+                                                   wk->bss->cbss.bssid);
                         break;
                 case RX_MGMT_CFG80211_ASSOC_TO:
-                        cfg80211_send_auth_timeout(sdata->dev,
-                                                   wk->bss->cbss.bssid,
-                                                   GFP_KERNEL);
+                        cfg80211_send_assoc_timeout(sdata->dev,
+                                                    wk->bss->cbss.bssid);
                         break;
                 default:
                         WARN(1, "unexpected: %d", wk->tries);
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 087d3377958f..f7dc7524e145 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -12,7 +12,7 @@
 #include "core.h"
 #include "nl80211.h"
 
-void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp)
+void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -23,6 +23,8 @@ void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len, gf
         u16 status = le16_to_cpu(mgmt->u.auth.status_code);
         bool done = false;
 
+        might_sleep();
+
         for (i = 0; i < MAX_AUTH_BSSES; i++) {
                 if (wdev->authtry_bsses[i] &&
                     memcmp(wdev->authtry_bsses[i]->pub.bssid, bssid,
@@ -41,12 +43,12 @@ void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len, gf
 
         WARN_ON(!done);
 
-        nl80211_send_rx_auth(rdev, dev, buf, len, gfp);
+        nl80211_send_rx_auth(rdev, dev, buf, len, GFP_KERNEL);
         cfg80211_sme_rx_auth(dev, buf, len);
 }
 EXPORT_SYMBOL(cfg80211_send_rx_auth);
 
-void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp)
+void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len)
 {
         u16 status_code;
         struct wireless_dev *wdev = dev->ieee80211_ptr;
@@ -57,12 +59,14 @@ void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len, g
         int i, ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
         bool done;
 
+        might_sleep();
+
         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
 
-        nl80211_send_rx_assoc(rdev, dev, buf, len, gfp);
+        nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL);
 
         cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
-                                status_code, gfp);
+                                status_code, GFP_KERNEL);
 
         if (status_code == WLAN_STATUS_SUCCESS) {
                 for (i = 0; wdev->current_bss && i < MAX_AUTH_BSSES; i++) {
@@ -80,7 +84,7 @@ void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len, g
 }
 EXPORT_SYMBOL(cfg80211_send_rx_assoc);
 
-void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp)
+void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -90,7 +94,9 @@ void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len, gfp
         int i;
         bool done = false;
 
-        nl80211_send_deauth(rdev, dev, buf, len, gfp);
+        might_sleep();
+
+        nl80211_send_deauth(rdev, dev, buf, len, GFP_KERNEL);
 
         if (wdev->current_bss &&
             memcmp(wdev->current_bss->pub.bssid, bssid, ETH_ALEN) == 0) {
@@ -132,16 +138,17 @@ void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len, gfp
                 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 
                 from_ap = memcmp(mgmt->da, dev->dev_addr, ETH_ALEN) == 0;
-                __cfg80211_disconnected(dev, gfp, NULL, 0,
+                __cfg80211_disconnected(dev, GFP_KERNEL, NULL, 0,
                                         reason_code, from_ap);
         } else if (wdev->sme_state == CFG80211_SME_CONNECTING) {
                 cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
-                                        WLAN_STATUS_UNSPECIFIED_FAILURE, gfp);
+                                        WLAN_STATUS_UNSPECIFIED_FAILURE,
+                                        GFP_KERNEL);
         }
 }
 EXPORT_SYMBOL(cfg80211_send_deauth);
 
-void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len, gfp_t gfp)
+void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -153,7 +160,9 @@ void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len, g
         bool from_ap;
         bool done = false;
 
-        nl80211_send_disassoc(rdev, dev, buf, len, gfp);
+        might_sleep();
+
+        nl80211_send_disassoc(rdev, dev, buf, len, GFP_KERNEL);
 
         if (!wdev->sme_state == CFG80211_SME_CONNECTED)
                 return;
@@ -177,12 +186,12 @@ void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len, g
         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 
         from_ap = memcmp(mgmt->da, dev->dev_addr, ETH_ALEN) == 0;
-        __cfg80211_disconnected(dev, gfp, NULL, 0,
+        __cfg80211_disconnected(dev, GFP_KERNEL, NULL, 0,
                                 reason_code, from_ap);
 }
 EXPORT_SYMBOL(cfg80211_send_disassoc);
 
-void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr, gfp_t gfp)
+void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -190,10 +199,13 @@ void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr, gfp_t gf
         int i;
         bool done = false;
 
-        nl80211_send_auth_timeout(rdev, dev, addr, gfp);
+        might_sleep();
+
+        nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
         if (wdev->sme_state == CFG80211_SME_CONNECTING)
                 cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
-                                        WLAN_STATUS_UNSPECIFIED_FAILURE, gfp);
+                                        WLAN_STATUS_UNSPECIFIED_FAILURE,
+                                        GFP_KERNEL);
 
         for (i = 0; addr && i < MAX_AUTH_BSSES; i++) {
                 if (wdev->authtry_bsses[i] &&
@@ -211,7 +223,7 @@ void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr, gfp_t gf
 }
 EXPORT_SYMBOL(cfg80211_send_auth_timeout);
 
-void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr, gfp_t gfp)
+void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -219,10 +231,13 @@ void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr, gfp_t g
         int i;
         bool done = false;
 
-        nl80211_send_assoc_timeout(rdev, dev, addr, gfp);
+        might_sleep();
+
+        nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
         if (wdev->sme_state == CFG80211_SME_CONNECTING)
                 cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
-                                        WLAN_STATUS_UNSPECIFIED_FAILURE, gfp);
+                                        WLAN_STATUS_UNSPECIFIED_FAILURE,
+                                        GFP_KERNEL);
 
         for (i = 0; addr && i < MAX_AUTH_BSSES; i++) {
                 if (wdev->auth_bsses[i] &&