From 91d3ab46730379e89e1e908c6f62fbcadb3d8f08 Mon Sep 17 00:00:00 2001
From: Vidyullatha Kanchanapally
Date: Fri, 30 Oct 2015 19:14:49 +0530
Subject: cfg80211: Add support for aborting an ongoing scan

Implement new functionality for aborting an ongoing scan.

Add NL80211_CMD_ABORT_SCAN to the nl80211 interface. After
aborting the scan, driver shall provide the scan status by
calling cfg80211_scan_done().

Reviewed-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Vidyullatha Kanchanapally <vkanchan@qti.qualcomm.com>
Signed-off-by: Sunil Dutt <usdutt@qti.qualcomm.com>
[change command to take wdev instead of netdev so that it
 can be used on p2p-device scans]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/wireless/nl80211.c  | 26 ++++++++++++++++++++++++++
 net/wireless/rdev-ops.h |  8 ++++++++
 net/wireless/trace.h    |  4 ++++
 3 files changed, 38 insertions(+)

(limited to 'net/wireless')

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 41e57d0c4d43..67e7b531db79 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5997,6 +5997,24 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+static int nl80211_abort_scan(struct sk_buff *skb, struct genl_info *info)
+{
+	struct cfg80211_registered_device *rdev = info->user_ptr[0];
+	struct wireless_dev *wdev = info->user_ptr[1];
+
+	if (!rdev->ops->abort_scan)
+		return -EOPNOTSUPP;
+
+	if (rdev->scan_msg)
+		return 0;
+
+	if (!rdev->scan_req)
+		return -ENOENT;
+
+	rdev_abort_scan(rdev, wdev);
+	return 0;
+}
+
 static int
 nl80211_parse_sched_scan_plans(struct wiphy *wiphy, int n_plans,
 			       struct cfg80211_sched_scan_request *request,
@@ -10944,6 +10962,14 @@ static const struct genl_ops nl80211_ops[] = {
 		.internal_flags = NL80211_FLAG_NEED_WDEV_UP |
 				  NL80211_FLAG_NEED_RTNL,
 	},
+	{
+		.cmd = NL80211_CMD_ABORT_SCAN,
+		.doit = nl80211_abort_scan,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+		.internal_flags = NL80211_FLAG_NEED_WDEV_UP |
+				  NL80211_FLAG_NEED_RTNL,
+	},
 	{
 		.cmd = NL80211_CMD_GET_SCAN,
 		.policy = nl80211_policy,
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index b8cc594d409d..8ae0c04f9fc7 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -427,6 +427,14 @@ static inline int rdev_scan(struct cfg80211_registered_device *rdev,
 	return ret;
 }
 
+static inline void rdev_abort_scan(struct cfg80211_registered_device *rdev,
+				   struct wireless_dev *wdev)
+{
+	trace_rdev_abort_scan(&rdev->wiphy, wdev);
+	rdev->ops->abort_scan(&rdev->wiphy, wdev);
+	trace_rdev_return_void(&rdev->wiphy);
+}
+
 static inline int rdev_auth(struct cfg80211_registered_device *rdev,
 			    struct net_device *dev,
 			    struct cfg80211_auth_request *req)
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 5b9139e53199..09b242b09bed 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2917,6 +2917,10 @@ TRACE_EVENT(rdev_set_coalesce,
 		  WIPHY_PR_ARG, __entry->n_rules)
 );
 
+DEFINE_EVENT(wiphy_wdev_evt, rdev_abort_scan,
+	TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev),
+	TP_ARGS(wiphy, wdev)
+);
 #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
 
 #undef TRACE_INCLUDE_PATH
-- 
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