mac80211: call drv_stop only if driver is started

If drv_start() fails during hw_restart, all the running
interfaces are being closed/stopped, which results in
drv_stop() being called, although the driver was never
started successfully.

This might cause drivers to perform operations on uninitialized
memory (as they assume it was initialized on drv_start)

Consider the local->started flag, and call the driver's stop()
op only if drv_start() succeeded before.

Move drv_start() and drv_stop() to driver-ops.c, as they are no
longer simple wrappers.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 48 insertions, 31 deletions

diff --git a/net/mac80211/driver-ops.c b/net/mac80211/driver-ops.c
index a1d54318f16c..9f97343f13fd 100644
--- a/net/mac80211/driver-ops.c
+++ b/net/mac80211/driver-ops.c
@@ -1,4 +1,6 @@
 /*
+ * Copyright 2015 Intel Deutschland GmbH
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
@@ -8,6 +10,48 @@
 #include "trace.h"
 #include "driver-ops.h"
 
+int drv_start(struct ieee80211_local *local)
+{
+        int ret;
+
+        might_sleep();
+
+        if (WARN_ON(local->started))
+                return -EALREADY;
+
+        trace_drv_start(local);
+        local->started = true;
+        /* allow rx frames */
+        smp_mb();
+        ret = local->ops->start(&local->hw);
+        trace_drv_return_int(local, ret);
+
+        if (ret)
+                local->started = false;
+
+        return ret;
+}
+
+void drv_stop(struct ieee80211_local *local)
+{
+        might_sleep();
+
+        if (WARN_ON(!local->started))
+                return;
+
+        trace_drv_stop(local);
+        local->ops->stop(&local->hw);
+        trace_drv_return_void(local);
+
+        /* sync away all work on the tasklet before clearing started */
+        tasklet_disable(&local->tasklet);
+        tasklet_enable(&local->tasklet);
+
+        barrier();
+
+        local->started = false;
+}
+
 int drv_add_interface(struct ieee80211_local *local,
                       struct ieee80211_sub_if_data *sdata)
 {
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 30987099eb8f..f82cfab615f2 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -66,36 +66,8 @@ static inline int drv_get_et_sset_count(struct ieee80211_sub_if_data *sdata,
         return rv;
 }
 
-static inline int drv_start(struct ieee80211_local *local)
-{
-        int ret;
-
-        might_sleep();
-
-        trace_drv_start(local);
-        local->started = true;
-        smp_mb();
-        ret = local->ops->start(&local->hw);
-        trace_drv_return_int(local, ret);
-        return ret;
-}
-
-static inline void drv_stop(struct ieee80211_local *local)
-{
-        might_sleep();
-
-        trace_drv_stop(local);
-        local->ops->stop(&local->hw);
-        trace_drv_return_void(local);
-
-        /* sync away all work on the tasklet before clearing started */
-        tasklet_disable(&local->tasklet);
-        tasklet_enable(&local->tasklet);
-
-        barrier();
-
-        local->started = false;
-}
+int drv_start(struct ieee80211_local *local);
+void drv_stop(struct ieee80211_local *local);
 
 #ifdef CONFIG_PM
 static inline int drv_suspend(struct ieee80211_local *local,
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index b0e3a4248bd5..551164dabbaf 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1665,7 +1665,6 @@ static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
 
         local->resuming = false;
         local->suspended = false;
-        local->started = false;
         local->in_reconfig = false;
 
         /* scheduled scan clearly can't be running any more, but tell
@@ -1764,6 +1763,8 @@ int ieee80211_reconfig(struct ieee80211_local *local)
         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
                 cancel_work_sync(&local->restart_work);
 
+        local->started = false;
+
         /*
          * Upon resume hardware can sometimes be goofy due to
          * various platform / driver / bus issues, so restarting