cfg80211: age scan results on resume

Scanned BSS entries are timestamped with jiffies, which doesn't
increment across suspend and hibernate.  On resume, every BSS in the
scan list looks like it was scanned within the last 10 seconds,
irregardless of how long the machine was actually asleep.  Age scan
results on resume with the time spent during sleep so userspace has a
clue how old they really are.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/wireless/sysfs.c b/net/wireless/sysfs.c
index 26a72b0797a0..15feaeb5ced5 100644
--- a/net/wireless/sysfs.c
+++ b/net/wireless/sysfs.c
@@ -60,6 +60,8 @@ static int wiphy_suspend(struct device *dev, pm_message_t state)
         struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
         int ret = 0;
 
+        rdev->suspend_at = get_seconds();
+
         if (rdev->ops->suspend) {
                 rtnl_lock();
                 ret = rdev->ops->suspend(&rdev->wiphy);
@@ -74,6 +76,11 @@ static int wiphy_resume(struct device *dev)
         struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
         int ret = 0;
 
+        /* Age scan results with time spent in suspend */
+        spin_lock_bh(&rdev->bss_lock);
+        cfg80211_bss_age(rdev, get_seconds() - rdev->suspend_at);
+        spin_unlock_bh(&rdev->bss_lock);
+
         if (rdev->ops->resume) {
                 rtnl_lock();
                 ret = rdev->ops->resume(&rdev->wiphy);