From: Alexander Yurchenko (grangecvs.openbsd.org)
Date: Thu Feb 19 2004 - 15:16:22 CST

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CVSROOT: /cvs
Module name: src
Changes by: grangecvs.openbsd.org 2004/02/19 14:16:21

Modified files:
        sys/dev/ic : wdc.c

Log message:
wdc logs fixes from costa:

1) wdc_get_log is at splbio() to prevent interrupt handlers from
updating the log
2) work hard to ensure that wdc_tail and wdc_head are between 0 and
wdc_log_cap, even if wdc_log or wdc_get_log is run concurrently against
itself. With this patch, running concurrent wdc_log's may corrupt the
log, but it should not cause any panics.
3) Make sure the buffer always starts on a record boundary. Otherwise
said, wdc_tail should always be on a record boundary.

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