[rds-devel] [PATCH net 2/2] RDS: TCP: Synchrnozize accept() and connect() paths on t_conn_lock.
Sowmini Varadhan
sowmini.varadhan at oracle.com
Mon May 2 09:43:07 PDT 2016
On (05/02/16 09:33), Santosh Shilimkar wrote:
> >+ mutex_unlock(&tc->t_conn_lock);
> Just wondering whether the spin_lock() would better here considering
> entry into rds_tcp_conn_connect() & rds_tcp_accept_one() might be
> from softirq context. Ignore it if its not applicable.
It's not from softirq context (both are workqs), but I used a mutex
to follow c_cm_lock (which I considered reusing, given that it
is only IB specific?) But spin_lock vs mutex may not be a big
differentiator here- this is really a one-time start up (corner-case)
issue in the control path.
> > rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING);
> Like patch 1/2, probably we can leverage return value of above.
:
> You probably don't need the local 'conn_state' and below should work.
> if (!rds_conn_connecting(conn) && !rds_conn_up(conn))
see explanation for comment to 1/2.
--Sowmini
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