• Johannes Berg's avatar
    cfg80211: send scan results from work queue · f9d15d16
    Johannes Berg authored
    
    
    Due to the previous commit, when a scan finishes, it is in theory
    possible to hit the following sequence:
     1. interface starts being removed
     2. scan is cancelled by driver and cfg80211 is notified
     3. scan done work is scheduled
     4. interface is removed completely, rdev->scan_req is freed,
        event sent to userspace but scan done work remains pending
     5. new scan is requested on another virtual interface
     6. scan done work runs, freeing the still-running scan
    
    To fix this situation, hang on to the scan done message and block
    new scans while that is the case, and only send the message from
    the work function, regardless of whether the scan_req is already
    freed from interface removal. This makes step 5 above impossible
    and changes step 6 to be
     5. scan done work runs, sending the scan done message
    
    As this can't work for wext, so we send the message immediately,
    but this shouldn't be an issue since we still return -EBUSY.
    Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
    f9d15d16
nl80211.h 3.28 KB