On Wed, 8 Jun 2016, J. Hannken-Illjes wrote:
Well, it almost works! Just one little problem... :) For some reason, the device's open() routine is being called twice, but the close() routine is only called once. So every iteration leaves the refcount with a net increment of one. I cannot figure out why/how the open routine is called twice.IIRC the device open() operation gets called on every open while the device close() operation gets called on last close only. See misfs/specfs/spec_vnops.c::spec_close().
yes, that would certainly explain the situation. It does, however, make it rather difficult to maintain a valid ref-count!
+------------------+--------------------------+------------------------+ | Paul Goyette | PGP Key fingerprint: | E-mail addresses: | | (Retired) | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com | | Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd.org | +------------------+--------------------------+------------------------+