Re: [RFC] simplify session shutdown

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On Thu, Jan 14, 2016 at 10:36:37AM -0800, Bart Van Assche wrote:
> These patches look interesting to me but I would appreciate it if an 
> additional aspect would be addressed by this patch series. How about 
> inserting a patch before patch 1/5 that makes the target core set a flag 
> with the meaning "shutdown_session()" has been called instead of relying on 
> sess_tearing_down ? The current implementation of the target core is based 
> on the assumption that the shutdown_session() callback calls 
> target_sess_cmd_list_set_waiting(). I'd like to get rid of this assumption 
> such that I can move that call in the ib_srpt and tcm_qla2xxx drivers from 
> the shutdown_session() callback to srpt_release_channel_work(). These two 
> drivers are namely the only drivers for which the 
> target_sess_cmd_list_set_waiting() and target_wait_for_sess_cmds() calls 
> occur from different functions. The next step would be to merge these two 
> functions into a single function.

In an ideal world we'd do target_sess_cmd_list_set_waiting before
calling ->close_session and include waiting for the command as part
of the session deregistration.

But currently there are only a few drivers that even need this scheme,
so this will need a careful audit of all fabrics drivers first.
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