Re: modprobe -r sbp2, not while drive connected

On 2004-09-02, Pat LaVarre wrote:
> If I try it with a drive connected, especially after hdparm and dd,
> then
> sometimes it hangs til reboot.
>
> Anybody care?

It is certainly worth a report on linux1394-devel. (That's were
bug reports go.)

> Even if the original automagic modprobe lacked the
> serialize_io=1 option?

This only modifies transfers or transfer requests. I don't think
it affects the SBP-2 logout in any way, and it is definitively
unrelated to host unregistration in the scsi midlevel. A pro
pos, the bug may also be caused by scsi, not sbp2. I believe I
heard of other host unregistration problems in scsi recently.

> If it helps, I could try to repeat consistently, capture dmesg, etc.

It would certainly good to know whether it (a) still occurs
with the last driver revisions and (b) under which
circumstances, if any can be determined.

> Are the dmesg more interesting if I step away from `make defconfig`,
> like
> with CONFIG_IEEE1394_VERBOSEDEBUG?

The debug logging in sbp2 is a bit different from most of the
other 1394 drivers. You should edit sbp2.c. Activate the
#define CONFIG_IEEE1394_SBP2_DEBUG 2 near the beginning of the
file. (Maybe this can alternatively be added to .config.)

-- 
Stefan Richter
http://arcgraph.de/sr/
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