[PATCH v3 memstick: support for legacy sony memsticks

[Maxim Levitsky]

Hi,
I am sending an updated version of the driver, this time
addressing comments by Tejun Heo


Changes since V2:

* Removed the mutex kludge - ordered worqueue indeed works well
* Removed manul major/minor handling
* Gave more specific names to two sg helpers.

Changes from V1:

* Replaced explicit state numbers with enum items.
  I agree that code is cleaner this way.

* Swithced to using a workqueue.
  Unfortunelly, I still see that workqueue items are executed in parallel
  I suspect that this happens if one work item sleeps. In this case I
  don't want other work items to run too. I fixed this with a mutex, and anyway
  it nice to have it to guaranteee this.

* moved sg_nents into scatterlist.c/h and put that in separate patch as
  requested

* Made functions static, fixed most whitespace issues (I hope all),
  and I hope addressed all other comments by Andrew Morton.


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