mac80211: resume properly, add suspend/resume test

When mac80211 resumes, it currently doesn't reconfigure the interfaces
entirely and also doesn't reconfigure BSS information -- fix this.

Also, to be able to test this, add a debugfs file that just calls
the suspend/resume code to see what happens when we go through that,
without needing the time-consuming suspend/resume cycle.

(Original version broke the build for CONFIG_PM=n.  Define alternative
functions for that situation. -- JWL)

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

1 files changed, 24 insertions, 0 deletions

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index e37f557de3f3..210b9b6fecd2 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -40,6 +40,10 @@ static const struct file_operations name## _ops = {			\
         local->debugfs.name = debugfs_create_file(#name, 0400, phyd,    \
                                                   local, &name## _ops);
 
+#define DEBUGFS_ADD_MODE(name, mode)                                    \
+        local->debugfs.name = debugfs_create_file(#name, mode, phyd,    \
+                                                  local, &name## _ops);
+
 #define DEBUGFS_DEL(name)                                               \
         debugfs_remove(local->debugfs.name);                            \
         local->debugfs.name = NULL;
@@ -113,6 +117,24 @@ static const struct file_operations tsf_ops = {
         .open = mac80211_open_file_generic
 };
 
+static ssize_t reset_write(struct file *file, const char __user *user_buf,
+                           size_t count, loff_t *ppos)
+{
+        struct ieee80211_local *local = file->private_data;
+
+        rtnl_lock();
+        __ieee80211_suspend(&local->hw);
+        __ieee80211_resume(&local->hw);
+        rtnl_unlock();
+
+        return count;
+}
+
+static const struct file_operations reset_ops = {
+        .write = reset_write,
+        .open = mac80211_open_file_generic,
+};
+
 /* statistics stuff */
 
 #define DEBUGFS_STATS_FILE(name, buflen, fmt, value...)                 \
@@ -254,6 +276,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
         DEBUGFS_ADD(total_ps_buffered);
         DEBUGFS_ADD(wep_iv);
         DEBUGFS_ADD(tsf);
+        DEBUGFS_ADD_MODE(reset, 0200);
 
         statsd = debugfs_create_dir("statistics", phyd);
         local->debugfs.statistics = statsd;
@@ -308,6 +331,7 @@ void debugfs_hw_del(struct ieee80211_local *local)
         DEBUGFS_DEL(total_ps_buffered);
         DEBUGFS_DEL(wep_iv);
         DEBUGFS_DEL(tsf);
+        DEBUGFS_DEL(reset);
 
         DEBUGFS_STATS_DEL(transmitted_fragment_count);
         DEBUGFS_STATS_DEL(multicast_transmitted_frame_count);