From scottr@netbsd.org: After servicing an interrupt, check to see that there's not another one pending before we clear the interrupt flag.  This avoids a condition where the line appears to go catatonic (which is particularly easily triggered by pppd).  From Bill Studenmund <wrstuden@loki.stanford.edu>. XXX - we should probably log this if it gets excessive.
From scottr@netbsd.org:
After servicing an interrupt, check to see that there's not another
one pending before we clear the interrupt flag.  This avoids a condition
where the line appears to go catatonic (which is particularly easily
triggered by pppd).  From Bill Studenmund <wrstuden@loki.stanford.edu>.
XXX - we should probably log this if it gets excessive.

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