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    Block: use a freezable workqueue for disk-event polling · 62d3c543
    Alan Stern 提交于
    This patch (as1519) fixes a bug in the block layer's disk-events
    polling.  The polling is done by a work routine queued on the
    system_nrt_wq workqueue.  Since that workqueue isn't freezable, the
    polling continues even in the middle of a system sleep transition.
    
    Obviously, polling a suspended drive for media changes and such isn't
    a good thing to do; in the case of USB mass-storage devices it can
    lead to real problems requiring device resets and even re-enumeration.
    
    The patch fixes things by creating a new system-wide, non-reentrant,
    freezable workqueue and using it for disk-events polling.
    Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
    CC: <stable@kernel.org>
    Acked-by: NTejun Heo <tj@kernel.org>
    Acked-by: NRafael J. Wysocki <rjw@sisk.pl>
    Signed-off-by: NJens Axboe <axboe@kernel.dk>
    62d3c543
workqueue.h 13.8 KB