• Liu ShuoX's avatar
    PM / Sleep: avoid 'autosleep' in shutdown progress · e5248a11
    Liu ShuoX authored
    Prevent automatic system suspend from happening during system
    shutdown by making try_to_suspend() check system_state and return
    immediately if it is not SYSTEM_RUNNING.
    
    This prevents the following breakage from happening (scenario from
    Zhang Yanmin):
    
     Kernel starts shutdown and calls all device driver's shutdown
     callback.  When a driver's shutdown is called, the last wakelock is
     released and suspend-to-ram starts.  However, as some driver's shut
     down callbacks already shut down devices and disabled runtime pm,
     the suspend-to-ram calls driver's suspend callback without noticing
     that device is already off and causes crash.
    
    [rjw: Changelog]
    Signed-off-by: default avatarLiu ShuoX <shuox.liu@intel.com>
    Cc: 3.5+ <stable@vger.kernel.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    e5248a11
autosleep.c 2.59 KB