[PATCH V2] UBI: add ubi_lnum_purge function to clear work queue for a lnum

[Artem Bityutskiy]

On Sat, 2012-05-19 at 13:47 +0300, Artem Bityutskiy wrote:
> If you walk the list and read pointers, and someone else modifies them,
> you may be in trouble. You cannot traverse the list without the
> spinlock. And once you dropped the spinlock - you have to start over
> because your 'wrk' pointer may point to a non-existing object, because
> this object might have been already freed. This is why I added 2 loops.

Actually we ourselves free it in ->func() :-) I think it is saner to not
even use the list_for_each_entry(), but just take the element off the
head, unlock the spinlock use "container_of()", and call ->func(). So we
need only one loop, not 2.

-- 
Best Regards,
Artem Bityutskiy
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