Date: Wed, 20 Oct 2010 07:47:31 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/mvs mvs.c Message-ID: <201010200747.o9K7ljxu023661@repoman.freebsd.org>
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mav 2010-10-20 07:47:31 UTC
FreeBSD src repository
Modified files:
sys/dev/mvs mvs.c
Log:
SVN rev 214102 on 2010-10-20 07:47:31Z by mav
Workaround strange situation when EDMA_RESQIP register returns zero instead
of proper value. It caused bunch of "EMPTY CRPB" messages and potentially
may cause premature requests completion, which could cause data corruption.
For most cases it seems enough to just reread register to get proper value.
To protect against worse cases - erase processed queue entries with
impossible values and ignore them if problem still happen.
Revision Changes Path
1.8 +31 -15 src/sys/dev/mvs/mvs.c
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