CVS commit: src/sys/dev/pci

[David Young <dyoung%netbsd.org@localhost>]

Module Name:    src
Committed By:   dyoung
Date:           Sat Mar  7 00:56:05 UTC 2009

Modified Files:
        src/sys/dev/pci: if_sip.c

Log Message:
Don't try to write the registers of the NIC to stop it if it is
already powered down.  This change prevents PCI bus exceptions
(indicated by NMI) when, for example, I detach the whole device
tree on a Soekris net4521:

com1: detached
NMI ... going to debugger
Stopped in pid 0.1 (system) at  netbsd:sipcom_stop+0x4d:        pushl   $0
db{0}> continue
NMI ... going to debugger
Stopped in pid 0.1 (system) at  netbsd:sipcom_stop+0x149:       addl    $0x10,%e
sp
db{0}> continue
sip0: detached

(On the AMD Elan SC520, the NMI occurs at the instruction after
the write or, if the write was posted, at either that instruction
or some later one.)


To generate a diff of this commit:
cvs rdiff -u -r1.135 -r1.136 src/sys/dev/pci/if_sip.c

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