Alan Stern 62d3c5439c
Block: use a freezable workqueue for disk-event polling ...
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: Alan Stern <stern@rowland.harvard.edu >
CC: <stable@kernel.org >
Acked-by: Tejun Heo <tj@kernel.org >
Acked-by: Rafael J. Wysocki <rjw@sisk.pl >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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