CVS commit: syssrc

[Scott Reynolds <scottr%netbsd.org@localhost>]

Module Name:    syssrc
Committed By:   scottr
Date:           Tue Mar  7 06:35:24 UTC 2000

Modified Files:
        syssrc/sys/arch/mac68k/dev: adb_direct.c

Log Message:
Low-level drivers, like the Power Manager driver, can get us into a major
funk when they misbehave and give us unexpected results.  Specifically:

 - Don't assume that the first free slot is at the top of the table if
   we can't find one.
 - Don't increment ADBNumDevices when backfilling "holes" left by devices
   that didn't respond to a TALK R3 during the initial device scan.
 - Don't assume that an address reassignment worked; make sure something
   responds on the new address before plowing forward.
 - If after device reassignment there are no free slots, make sure to
   indicate this fact.
 - Failing all else, handle the situation where we run out of slots in
   the device table -- which now should "never" happen -- gracefully.

While the Power Manager driver still sometimes misbehaves, it shouldn't
cause the system to crash/hang due to us walking off the end of the
device table.


To generate a diff of this commit:
cvs rdiff -r1.38 -r1.39 syssrc/sys/arch/mac68k/dev/adb_direct.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.