Re: [PATCH 0/2] sg: fix races during device removal (v2)

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

I wrote:
> One number is
>   - the number of unfinished transactions (request->response)
> of an sg device. [...] The other number is
>   - the number of contexts which peek and poke at the device
> representation's memory. [...]
> And we need one more thing to finally get all pieces together:  A state
> flag which says "device still open? yes/no".  This flag is necessary to
> decide when to take the device representation out of the idr:

You probably don't need an explicit counter of pending transactions.
This number is implicit in the number of list members in struct
sg_fd.headrp.

So you only need the reference counter and the open-or-closed flag
(which would be different from struct sg_fd.closed).
-- 
Stefan Richter
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http://arcgraph.de/sr/