Re: 2.6.13-mm1: hangs during boot ...

[James Bottomley]

On Sat, 2005-09-03 at 23:51 +1000, Peter Williams wrote:
> > Are you seeing this "Device  not ready" message appear over and over, or 
> > just the once?
> 
> Just the once.

OK, I finally have a theory about this.  It's the everything goes via
bios code.  Previously there were several levels at which commands could
exit the SCSI stack; now we make everything go via bios, so they all
come out at the top.

get_capabilities() in sr.c is sending a TEST_UNIT_READY which will get
NOT_READY back.  Previously this was completing before it got to
scsi_io_completion(); now it doesn't.  There must be quite a few cases
like this.  The best fix is probably to use and respect REQ_QUIET for
internally generated commands.

James


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