Messages in this thread | | | Subject | Re: 2.6.13-mm1: hangs during boot ... | From | James Bottomley <> | Date | Sat, 03 Sep 2005 12:14:16 -0400 |
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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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