K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2015-11-11T18:54:49.115024Z
K 7
svn:log
V 598
NTB: Skip db_valid validation writing DB link bit

In ntb_poll_link, we are intentionally writing the link bit, which is
absent from db_valid_mask.  Don't panic on a kassert when we do so.

The Linux version of this (dual BSD/GPL) driver has the db_valid_mask
assertions in callers of db_iowrite() rather than db_iowrite() itself;
it skips the assertions in the equivalent of ntb_poll_link().  Rather
than duplicating the assertions in every caller, add a db_iowrite_raw()
that doesn't check and use it from ntb_poll_link().

Suggested by:	kassert_panic
Sponsored by:	EMC / Isilon Storage Division

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