cfg80211: process events caused by suspend before suspending

When suspending without WoWLAN, cfg80211 will ask drivers to
disconnect. Even when the driver does this synchronously, and
immediately returns with a notification, cfg80211 schedules
the handling thereof to a workqueue, and may then call back
into the driver when the driver was already suspended/ing.

Fix this by processing all events caused by cfg80211_leave_all()
directly after that function returns. The driver still needs to
do the right thing here and wait for the firmware response, but
that is - at least - true for mwifiex where this occurred.

Reported-by: Amitkumar Karwar <akarwar@marvell.com>
Tested-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/sysfs.c b/net/wireless/sysfs.c
index 0082f4b..14b3f00 100644 (file)
--- a/net/wireless/sysfs.c
+++ b/net/wireless/sysfs.c
@@ -104,13 +104,16 @@ static int wiphy_suspend(struct device *dev)
 
        rtnl_lock();
        if (rdev->wiphy.registered) {
-               if (!rdev->wiphy.wowlan_config)
+               if (!rdev->wiphy.wowlan_config) {
                        cfg80211_leave_all(rdev);
+                       cfg80211_process_rdev_events(rdev);
+               }
                if (rdev->ops->suspend)
                        ret = rdev_suspend(rdev, rdev->wiphy.wowlan_config);
                if (ret == 1) {
                        /* Driver refuse to configure wowlan */
                        cfg80211_leave_all(rdev);
+                       cfg80211_process_rdev_events(rdev);
                        ret = rdev_suspend(rdev, NULL);
                }
        }